Human anatomy  final exam prep (part 2)

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson
Download our mobile app to listen on the go
Get App

Questions and Answers

Which of the following processes is NOT directly involved in the formation of urine within the nephron?

  • Tubular reabsorption
  • Glomerular filtration
  • Tubular secretion
  • Erythropoiesis (correct)

What primary characteristic of the glomerular filter prevents blood cells and large proteins from entering the filtrate?

  • Electrical charge of the filter
  • Filter size (correct)
  • Hydrostatic pressure
  • Active transport mechanisms

How does increased blood pressure affect filtration rate in the glomerulus, assuming other factors remain constant?

  • Initially increases, then decreases filtration rate due to glomerular damage
  • Has no effect on filtration rate, as the kidney autoregulates pressure
  • Decreases filtration rate by constricting afferent arterioles
  • Increases filtration rate due to higher pressure pushing more fluid through the filter (correct)

During the reabsorption process, where do substances move from and to?

<p>From the renal tubule to the peritubular capillaries (C)</p> Signup and view all the answers

What is the primary difference between tubular reabsorption and tubular secretion?

<p>Reabsorption moves substances back into the blood, while secretion moves substances into the urine. (A)</p> Signup and view all the answers

In which part of the nephron is the majority of water reabsorbed?

<p>Descending loop of Henle (C)</p> Signup and view all the answers

What role do endocrine glands play in maintaining optimal internal balance within the kidneys?

<p>They release hormones that can affect filtration rate and urine production. (D)</p> Signup and view all the answers

How do the kidneys contribute to maintaining acid-base balance in the body?

<p>By balancing the levels of hydrogen ions (H+) and bicarbonate ions (HCO3) (D)</p> Signup and view all the answers

What type of tissue lines the urinary bladder, allowing it to expand as it fills with urine?

<p>Transitional epithelium (B)</p> Signup and view all the answers

What triggers the urination reflex when the bladder fills with urine?

<p>The stretching of the bladder walls (C)</p> Signup and view all the answers

Why are urinary tract infections (UTIs) more common in women than in men?

<p>Women's urethras are shorter, allowing bacteria easier and quicker access to the bladder. (A)</p> Signup and view all the answers

Why is it important to promptly treat urinary infections?

<p>To prevent kidney damage from the infection spreading (D)</p> Signup and view all the answers

How does the sympathetic nervous system (fight or flight) influence urine formation?

<p>It slows down urine formation by causing vasoconstriction of afferent arterioles (B)</p> Signup and view all the answers

What happens to the concentration of glomerular filtrate once it leaves the collecting ducts?

<p>Its concentration cannot be changed as it is now urine (C)</p> Signup and view all the answers

What is the significance of the pleats called rugae in the urinary bladder?

<p>They enhance the bladder's ability to stretch as it fills. (C)</p> Signup and view all the answers

How might a decrease in kidney function affect medication dosages in older adults?

<p>Medication dosages may need to be decreased to prevent toxic buildup. (C)</p> Signup and view all the answers

Which of the following best describes the impact of aging on bladder function?

<p>Decreased bladder muscle tone leading to increased incontinence (A)</p> Signup and view all the answers

Which process is primarily affected when afferent arterioles constrict due to adrenaline release?

<p>Glomerular Filtration (D)</p> Signup and view all the answers

A patient's urine sample reveals the presence of glucose. Which specific function of the nephron was most likely impaired, leading to this?

<p>Reabsorption (B)</p> Signup and view all the answers

Why might a doctor advise a patient with recurring UTIs to drink plenty of water?

<p>To dilute the urine and flush out bacteria (C)</p> Signup and view all the answers

Which of the following accurately describes the role of the uvula in the digestive process?

<p>It aids in swallowing by directing food toward the pharynx and preventing entry into the nasal cavity. (C)</p> Signup and view all the answers

How do the submandibular salivary glands contribute to the digestive process?

<p>By secreting saliva containing antibodies and enzymes that aid in food breakdown. (B)</p> Signup and view all the answers

How do the nasopharynx, oropharynx, and laryngopharynx each contribute to the digestive or respiratory processes?

<p>The nasopharynx is for air only, while the oropharynx and laryngopharynx handle both air and food. (D)</p> Signup and view all the answers

What is the primary function of peristalsis in the esophagus?

<p>To propel food down the esophagus to the stomach through rhythmic muscle contractions. (D)</p> Signup and view all the answers

Which tissue type primarily composes the mucosa layer of the alimentary canal, aiding in its function of absorption and secretion?

<p>Surface epithelium with connective tissue (B)</p> Signup and view all the answers

How does the arrangement of muscle layers in the muscularis externa of the alimentary canal facilitate peristalsis?

<p>The muscularis externa has an inner circular layer and an outer longitudinal layer that work together to propel food. (B)</p> Signup and view all the answers

How do the rugae in the stomach contribute to its function?

<p>They allow the stomach to expand and hold more food. (C)</p> Signup and view all the answers

What is the role of hydrochloric acid (HCl) in gastric juice within the stomach?

<p>To activate pepsinogen into pepsin, which digests proteins. (B)</p> Signup and view all the answers

What characteristic of chyme is important for nutrient absorption in the small intestine?

<p>Its rate of movement ensures proper mixing with gastric juices. (C)</p> Signup and view all the answers

How does segmentation, a type of muscular action in the small intestine, contribute to the digestive process?

<p>It mixes chyme with digestive juices, facilitating digestion. (B)</p> Signup and view all the answers

What is the purpose of sodium bicarbonate secreted by the pancreas into the small intestine?

<p>To neutralize the acidity of chyme from the stomach. (B)</p> Signup and view all the answers

Which of the following is a primary function of the large intestine?

<p>Absorbing water and compacting waste for elimination. (C)</p> Signup and view all the answers

What occurs when fecal matter remains in the large intestine for an extended period?

<p>Constipation occurs as excess water is absorbed. (B)</p> Signup and view all the answers

How does the colon contribute to maintaining fluid balance in the body?

<p>By reabsorbing some of the water and electrolytes used in digestion. (B)</p> Signup and view all the answers

Which quadrant of the abdomen would contain the majority of the stomach and spleen?

<p>Left Upper Quadrant (C)</p> Signup and view all the answers

How does the body prevent food from entering the trachea during swallowing?

<p>The epiglottis covers the opening of the trachea, directing food into the esophagus. (A)</p> Signup and view all the answers

What would happen if the pyloric sphincter were to malfunction and remain continuously open?

<p>The chyme would enter the small intestine rapidly leading to inefficient digestion. (A)</p> Signup and view all the answers

What digestive process is most directly affected by the removal of the gallbladder?

<p>Fat emulsification in the small intestine (B)</p> Signup and view all the answers

What distinguishes the ileum from the duodenum and jejunum in terms of its function in the small intestine?

<p>The ileum connects to the large intestine. (A)</p> Signup and view all the answers

What triggers the defecation reflex as part of the digestive process?

<p>The rectum fills with feces (A)</p> Signup and view all the answers

How does the liver contribute to the digestive system as an accessory organ?

<p>By producing bile, which aids in the digestion and absorption of fats. (D)</p> Signup and view all the answers

What is the primary function of bile salts in the process of emulsification?

<p>To increase the surface area of fats, allowing digestive enzymes to work more effectively. (A)</p> Signup and view all the answers

If the hepatic duct were to become blocked, which of the following processes would be most directly affected?

<p>The transport of bile from the liver to the gallbladder. (B)</p> Signup and view all the answers

How does the concentration of bile change as it is stored in the gallbladder?

<p>It becomes more concentrated as water is absorbed. (C)</p> Signup and view all the answers

What is the most likely consequence of having overly concentrated bile in the gallbladder?

<p>Formation of gallstones due to solidification of bile salts. (B)</p> Signup and view all the answers

What role do buffers secreted by the pancreas play in digestion?

<p>To neutralize the acidity of chyme entering the duodenum. (A)</p> Signup and view all the answers

How is the location of the pancreas beneficial for its role in digestion?

<p>Its location posterior to the stomach and extending to the duodenum allows it to secrete digestive enzymes and buffers into the small intestine. (C)</p> Signup and view all the answers

Which of the following symptoms is directly related to the body's attempt to eliminate irritants from the digestive tract?

<p>Vomiting (D)</p> Signup and view all the answers

What is the underlying cause of diarrhea as a digestive disorder?

<p>Rapid movement of fluid contents through the large intestine, preventing water reabsorption. (D)</p> Signup and view all the answers

How does constipation primarily affect the composition of feces?

<p>It decreases the water content, making the feces harder and drier. (B)</p> Signup and view all the answers

Which of the following processes is most likely to be affected by a decrease in saliva production?

<p>Initial carbohydrate digestion in the mouth. (D)</p> Signup and view all the answers

How might a significant decrease in digestive juices impact nutrient absorption?

<p>It would impair the breakdown of food, reducing the amount of nutrients available for absorption. (C)</p> Signup and view all the answers

What is the main role of the cystic duct in the digestive system?

<p>To carry bile from the gallbladder to the common bile duct. (D)</p> Signup and view all the answers

If a patient has their gallbladder removed, what dietary adjustment is typically recommended and why?

<p>Reduce fat intake because the body's ability to emulsify and digest fats is compromised. (B)</p> Signup and view all the answers

Which of the following best describes the role of bilirubin in the digestive process?

<p>It helps absorb fat from the small intestine, transports bilirubin and excess cholesterol to the intestine for elimination (A)</p> Signup and view all the answers

How does the liver contribute to maintaining glucose homeostasis in the body?

<p>By storing glucose as glycogen and releasing it when needed. (B)</p> Signup and view all the answers

What is the function of the liver in relation to blood clotting?

<p>It produces the factors needed for blood clotting. (A)</p> Signup and view all the answers

How does aging affect the digestive process, specifically the production of digestive juices?

<p>Aging decreases the production of digestive juices, potentially impairing nutrient absorption. (B)</p> Signup and view all the answers

Which function of the liver directly helps in ridding the body of harmful substances like certain drugs and alcohol?

<p>Detoxification. (B)</p> Signup and view all the answers

What role does the liver play in maintaining body temperature?

<p>It creates body heat. (A)</p> Signup and view all the answers

In systemic circulation, what is the destination of blood after it leaves the heart?

<p>The body tissues, to deliver oxygen and nutrients (D)</p> Signup and view all the answers

What is the functional significance of capillaries being composed of only the tunica intima?

<p>It facilitates efficient exchange of gases and nutrients. (B)</p> Signup and view all the answers

How do veins counteract the effects of gravity to ensure blood returns to the heart effectively?

<p>The presence of valves that prevent backflow (A)</p> Signup and view all the answers

What would be the consequence if the heart's left ventricle was significantly weakened?

<p>Backup of blood into the lungs (A)</p> Signup and view all the answers

How does increased blood volume affect blood pressure, assuming other factors remain constant?

<p>Increases blood pressure due to increased cardiac output (B)</p> Signup and view all the answers

What is the role of the sinoatrial (SA) node in the heart's function?

<p>To initiate the electrical impulse for heart contraction (C)</p> Signup and view all the answers

What is the significance of blood undergoing pulmonary circulation?

<p>To exchange carbon dioxide for oxygen in the lungs (C)</p> Signup and view all the answers

How does vasoconstriction contribute to the regulation of blood pressure?

<p>It increases peripheral resistance, raising blood pressure. (D)</p> Signup and view all the answers

What is the function of fibrinogen, a plasma protein found in blood?

<p>Facilitating blood clotting (A)</p> Signup and view all the answers

How do coronary arteries support the function of the heart?

<p>By providing oxygenated blood to the heart muscle itself (D)</p> Signup and view all the answers

During the cardiac cycle, what event occurs during diastole?

<p>The heart chambers fill with blood. (C)</p> Signup and view all the answers

What is the immediate result of the release of chemicals from sticky platelets at a damaged site??

<p>Recruitment of more platelets to form a plug (D)</p> Signup and view all the answers

Which of the following best describes the process of phagocytosis carried out by white blood cells?

<p>Ingesting and destroying invaders (B)</p> Signup and view all the answers

Why are individuals with atherosclerosis at a higher risk for heart attacks and strokes?

<p>Plaques have built up and narrowed their arteries. (C)</p> Signup and view all the answers

What change in blood vessel structure is characteristic of arteriosclerosis?

<p>Thickening and hardening of the tunica interna (B)</p> Signup and view all the answers

How does the pericardial cavity contribute to heart function?

<p>It allows the heart to expand and contract within a confined space. (D)</p> Signup and view all the answers

Which blood vessels directly deliver oxygenated blood to the left atrium?

<p>The pulmonary veins (A)</p> Signup and view all the answers

What is the function of the bicuspid valve?

<p>Preventing blood backflow from the left ventricle to the left atrium (C)</p> Signup and view all the answers

How does blood flow differ between the pulmonary arteries and other arteries in the body?

<p>Pulmonary arteries carry deoxygenated blood away from the heart, while other arteries carry oxygenated blood. (D)</p> Signup and view all the answers

As people age, how would the decreased flexibility of blood vessels affect blood pressure?

<p>Reduced ability to regulate blood pressure effectively (A)</p> Signup and view all the answers

How does the respiratory system work with the cardiovascular system to maintain bodily function?

<p>By carrying oxygen from the lungs to the body and transporting carbon dioxide back. (B)</p> Signup and view all the answers

What is the primary function of the respiratory system?

<p>To facilitate the exchange of gases between the body and the environment. (B)</p> Signup and view all the answers

What is the likely result of excessive carbon dioxide buildup in the blood?

<p>A toxic condition that can harm organs. (A)</p> Signup and view all the answers

What are the terminal air sacs in the lungs responsible for?

<p>Exchanging oxygen and carbon dioxide with the capillaries. (A)</p> Signup and view all the answers

How do the upper airways contribute to the quality of air that reaches the lungs?

<p>By heating or cooling, filtering, and humidifying the air. (C)</p> Signup and view all the answers

Which structure is primarily responsible for directing air into the trachea instead of the esophagus during swallowing?

<p>The epiglottis. (B)</p> Signup and view all the answers

What is the role of cilia in the respiratory tract?

<p>To propel mucus and trapped particles upward to be expelled. (C)</p> Signup and view all the answers

How do the sinuses contribute to respiratory function and overall comfort?

<p>By lightening the skull's weight, warming/moistening air, and affecting voice resonance. (D)</p> Signup and view all the answers

What is the functional difference between the nasopharynx and the oropharynx?

<p>The nasopharynx is strictly an air passageway, while the oropharynx also handles food and liquid. (D)</p> Signup and view all the answers

What structural feature primarily prevents the trachea from collapsing?

<p>The C-shaped cartilage rings. (A)</p> Signup and view all the answers

How does the division of the bronchi into lobar bronchi relate to lung anatomy?

<p>Each lobar bronchus corresponds to a lobe of the lung. (D)</p> Signup and view all the answers

What structural changes occur as the bronchi transition into bronchioles?

<p>A decrease in cartilage and an increase in smooth muscle. (B)</p> Signup and view all the answers

Where does external respiration occur?

<p>In the alveoli of the lungs. (B)</p> Signup and view all the answers

During internal respiration, what is being diffused and where is it going?

<p>Oxygen is diffused from the blood to the cells. (D)</p> Signup and view all the answers

What type of cells line the airways of the respiratory system and have hair-like projections?

<p>Pseudostratified ciliated columnar cells. (C)</p> Signup and view all the answers

What happens to the air that passes through the oropharynx?

<p>It is directed towards either the larynx or the esophagus. (D)</p> Signup and view all the answers

According to the content, why should mammals typically breathe through their noses instead of their mouths?

<p>The nose warms, humidifies, and filters air better than the mouth. (D)</p> Signup and view all the answers

Which of the following accurately describes the role of the pharynx in respiration?

<p>It serves as a shared pathway for both air and food or liquid. (D)</p> Signup and view all the answers

Which is the correct order of air movement through the lower respiratory tract?

<p>Trachea, Bronchi, Bronchioles (D)</p> Signup and view all the answers

What is the purpose of alveolar structure?

<p>Gas exchange in the lungs. (C)</p> Signup and view all the answers

What structural characteristic of the alveoli directly facilitates gas exchange with pulmonary capillaries?

<p>The thin alveolar-capillary membrane. (A)</p> Signup and view all the answers

How does the position of the lungs within the thoracic cavity contribute to their function?

<p>It separates the lungs, protecting them and creating pressure gradients that aid breathing. (B)</p> Signup and view all the answers

How does pleural fluid contribute to the mechanical process of breathing?

<p>By reducing friction between the lungs and the thoracic wall, allowing for smoother movement during breathing. (A)</p> Signup and view all the answers

Why does the right lung typically sit slightly higher than the left lung within the thoracic cavity?

<p>To accommodate the position of the liver. (A)</p> Signup and view all the answers

Which of the following best explains how the medulla oblongata responds to increased carbon dioxide levels in the blood?

<p>It signals the respiratory muscles to increase the rate and depth of breathing. (D)</p> Signup and view all the answers

During inspiration, what mechanical change directly leads to air rushing into the lungs?

<p>The increase in thoracic cavity volume decreases intrapulmonary pressure. (A)</p> Signup and view all the answers

Accessory muscles become most important in which of the following scenarios?

<p>During periods of increased oxygen demand, such as exercise. (C)</p> Signup and view all the answers

What is the primary mechanism that drives exhalation under normal, resting conditions?

<p>The elastic recoil of the lungs, causing a decrease in thoracic volume. (A)</p> Signup and view all the answers

How does emphysema, a form of COPD, directly impair respiratory function?

<p>By destroying alveoli, which reduces the surface area for gas exchange. (A)</p> Signup and view all the answers

What physiological change is directly responsible for the bronchospasms seen in asthma?

<p>Constriction of the smooth muscles surrounding the airways. (D)</p> Signup and view all the answers

What is the significance of the hilum of the lung?

<p>It is where the main bronchus, blood vessels, and nerves enter the lung. (A)</p> Signup and view all the answers

What causes the blue coloring to lips and nail beds (cyanosis)?

<p>Low levels of oxygen in the blood (B)</p> Signup and view all the answers

What does COPD refer to?

<p>A general disease where one has a hard time getting air out of the lungs. (D)</p> Signup and view all the answers

What is the effect of increased volume in the thoracic cavity?

<p>Decreased pressure inside of the lungs. (D)</p> Signup and view all the answers

Which of the following muscles help pull up the rib cage to make even larger space in the thoracic cavity?

<p>Accessory muscles (A)</p> Signup and view all the answers

What is the main cause of respiratory disease?

<p>Smoking (A)</p> Signup and view all the answers

What part of the brain is the respiratory control center in?

<p>Medulla oblongata (D)</p> Signup and view all the answers

What is caused by the return of the diaphragm to a resting state?

<p>Exhalation (A)</p> Signup and view all the answers

What do the accessory muscles of exhalation do?

<p>Assist in more forceful and active exhalation by increasing abdominal pressure. (A)</p> Signup and view all the answers

What causes the inflammatory process in the airways?

<p>Asthma (D)</p> Signup and view all the answers

What role does the endocrine system play that is similar to the nervous system?

<p>Acting as a control center for the body's organs. (C)</p> Signup and view all the answers

How do hormones exert their effects on target cells?

<p>By binding to receptors on or in target cells. (B)</p> Signup and view all the answers

What is the primary mechanism by which the endocrine system maintains homeostasis after a disturbance?

<p>Negative feedback, reversing the initial change. (C)</p> Signup and view all the answers

What is the relationship between the hypothalamus and the pituitary gland?

<p>The hypothalamus controls the pituitary gland, which in turn regulates other glands. (C)</p> Signup and view all the answers

How does the posterior pituitary differ from the anterior pituitary in terms of hormone production?

<p>The posterior pituitary is mainly under neural control from the hypothalamus; the anterior pituitary is under hormonal control. (A)</p> Signup and view all the answers

Under what conditions is antidiuretic hormone (ADH) released?

<p>When the body is dehydrated or blood pressure drops. (D)</p> Signup and view all the answers

What is the direct effect of antidiuretic hormone (ADH) on the kidneys?

<p>It promotes the reabsorption of water in the distal tubule and collecting duct. (A)</p> Signup and view all the answers

How does thyroid-stimulating hormone (TSH) regulate thyroid hormone levels?

<p>TSH stimulates the thyroid gland to produce and release T3 and T4. (A)</p> Signup and view all the answers

What is the role of iodine in thyroid hormone production?

<p>Iodine is a structural component of both T3 and T4. (D)</p> Signup and view all the answers

How do T3 and T4 affect metabolism in the body?

<p>They increase the use of proteins, fats, and glucose for energy. (D)</p> Signup and view all the answers

What is the underlying cause of Hashimoto's disease?

<p>An autoimmune attack on the thyroid gland. (A)</p> Signup and view all the answers

In Graves' disease, what is the primary abnormality?

<p>The immune system stimulates the thyroid gland to overproduce thyroid hormones. (C)</p> Signup and view all the answers

What is the main function of the pancreas in maintaining blood glucose levels?

<p>To secrete insulin and glucagon in response to blood glucose levels. (A)</p> Signup and view all the answers

How does insulin affect blood glucose levels?

<p>It facilitates the uptake of glucose by cells, lowering blood glucose levels. (D)</p> Signup and view all the answers

What is the function of glucagon?

<p>To promote the breakdown of glycogen in the liver, raising blood glucose levels. (D)</p> Signup and view all the answers

Where are the adrenal glands located?

<p>On top of the kidneys. (D)</p> Signup and view all the answers

What are the two main regions of the adrenal glands?

<p>The adrenal cortex and the adrenal medulla. (D)</p> Signup and view all the answers

What type of hormones are released by the adrenal cortex?

<p>Steroid hormones. (C)</p> Signup and view all the answers

What hormones are released by the adrenal medulla?

<p>Epinephrine (adrenaline) and norepinephrine. (A)</p> Signup and view all the answers

What is the primary classification of hormones?

<p>Chemical messengers. (D)</p> Signup and view all the answers

Which of the following is the primary function of neutrophils in the immune response?

<p>Phagocytizing pathogens at the site of damage (D)</p> Signup and view all the answers

How do macrophages contribute to the later stages of an infection?

<p>By phagocytizing pathogens and cellular debris (C)</p> Signup and view all the answers

What is the main role of basophils and mast cells in the immune response?

<p>Releasing chemicals to promote inflammation (C)</p> Signup and view all the answers

What is the primary mechanism by which Natural Killer (NK) cells eliminate infected or cancerous cells?

<p>Releasing chemicals to induce apoptosis (cell death) in cells displaying foreign antigens (B)</p> Signup and view all the answers

How do T lymphocytes contribute to adaptive immunity?

<p>By releasing chemicals to kill pathogens and helping with overall immunity (A)</p> Signup and view all the answers

What is the function of B lymphocytes in adaptive immunity?

<p>Producing antibodies that allow the body to recognize pathogens (A)</p> Signup and view all the answers

What is the main characteristic of innate immunity?

<p>It is present from birth and provides immediate defense against pathogens (A)</p> Signup and view all the answers

How does adaptive immunity differ from innate immunity?

<p>Adaptive immunity involves the recognition of specific invaders, while innate immunity is non-specific (B)</p> Signup and view all the answers

Which of the following events occurs during the process of inflammation?

<p>The release of histamine from mast cells (C)</p> Signup and view all the answers

What is the initial step in the inflammatory response after tissue damage?

<p>The release of chemicals such as histamine (C)</p> Signup and view all the answers

What cellular process describes how white blood cells (WBCs) destroy foreign invaders?

<p>Phagocytosis (B)</p> Signup and view all the answers

What is the role of antigens in the immune system?

<p>To identify whether a cell is supposed to be in the body (A)</p> Signup and view all the answers

How do antibodies help to eliminate pathogens from the body?

<p>By identifying the foreign antigens on the pathogen (B)</p> Signup and view all the answers

What is margination in the context of the inflammatory response?

<p>The process by which WBCs stick to the capillary walls near the site of infection (A)</p> Signup and view all the answers

What is diapedesis in the context of the immune response?

<p>The process by which WBCs pass through the walls of blood vessels (C)</p> Signup and view all the answers

What is a common characteristic of immunodeficiency disorders?

<p>Inability of the immune system to respond properly to pathogens (D)</p> Signup and view all the answers

What is the role of histamine in allergic reactions?

<p>To trigger the symptoms of an allergic reaction (C)</p> Signup and view all the answers

What is the life-threatening condition caused by systemic hypersensitivity?

<p>Anaphylaxis (A)</p> Signup and view all the answers

What is the function of cytokines in the immune system?

<p>To help the adaptive and innate immunity. (D)</p> Signup and view all the answers

The redness associated with inflammation is primarily due to which of the following?

<p>Increased vasodilation in the capillaries (B)</p> Signup and view all the answers

What is the primary role of the lymphatic system in relation to the immune system?

<p>To serve as a filtration system, maintaining fluid balance and transporting pathogens to lymph nodes. (D)</p> Signup and view all the answers

How do lymphatic capillaries differ from blood capillaries in terms of permeability?

<p>Lymphatic capillaries are more permeable, allowing easier passage of extra fluid and larger molecules. (C)</p> Signup and view all the answers

What is the specific role of lymph nodes in lymphatic function?

<p>To filter lymph fluid and facilitate the destruction of pathogens. (C)</p> Signup and view all the answers

In what order does lymph flow through the lymphatic system?

<p>Lymph capillaries → Lymphatic vessels → Lymph nodes → Lymphatic trunks → Ducts (D)</p> Signup and view all the answers

What is the relationship between lymphatic vessels and lymphatic trunks?

<p>Lymphatic vessels are smaller vessels that carry lymph to larger lymphatic trunks. (B)</p> Signup and view all the answers

Considering the structure of the lymphatic system, why is the presence of lymph nodes significant in areas prone to pathogen invasion?

<p>The concentration of lymphocytes and macrophages in lymph nodes allows for targeted immune responses. (A)</p> Signup and view all the answers

In addition to filtration, what other critical function does the lymphatic system perform?

<p>Absorbing some nutrients from the digestive system. (B)</p> Signup and view all the answers

What is the primary difference in function between lymph nodes and the spleen within the lymphatic system?

<p>Lymph nodes filter lymph, while the spleen filters blood. (D)</p> Signup and view all the answers

Why is the thymus more active and larger in children than in adults?

<p>The thymus is essential for the maturation of T lymphocytes, and its role decreases as the body develops immunity. (B)</p> Signup and view all the answers

How do the lymphatic ducts contribute to maintaining fluid balance within the body?

<p>By transporting excess interstitial fluid back into the bloodstream. (A)</p> Signup and view all the answers

What is the role of T lymphocytes within the lymphatic system?

<p>Maturing within the thymus and participating in cell-mediated immunity. (B)</p> Signup and view all the answers

Why is it important for the lymphatic system to recycle extra fluid from the cardiovascular system?

<p>To prevent tissue swelling and maintain appropriate fluid balance. (A)</p> Signup and view all the answers

What is the functional significance of the spleen's location in the left upper quadrant of the abdomen?

<p>The spleen's proximity to major blood vessels facilitates efficient filtering and removal of damaged blood cells. (A)</p> Signup and view all the answers

How does the filtering action of lymph nodes contribute to the activation of the adaptive immune response?

<p>By concentrating antigens and immune cells, facilitating their interaction and activation. (D)</p> Signup and view all the answers

What best explains the clinical relevance of understanding the lymphatic system's role in absorbing nutrients?

<p>Understanding fat absorption helps manage nutritional deficiencies. (D)</p> Signup and view all the answers

What is the difference between the roles of lymph nodes and T lymphocytes in the lymphatic system?

<p>Lymph nodes filter lymph, while T lymphocytes are a type of white blood cell that mature and initiate cell-mediated immune responses. (B)</p> Signup and view all the answers

How does the maturation of T lymphocytes in the thymus contribute to the development of immunological competence?

<p>By ensuring the development of self-tolerance, thereby preventing autoimmune reactions. (D)</p> Signup and view all the answers

Why are there two lymphatic systems?

<p>There are not two different lymphatic systems. The content is referring to the Lymphatic and the Immune systems. (D)</p> Signup and view all the answers

Pathogens are harmful, but why does the body allow them into the lymphatic system?

<p>Pathogens must be taken to the lymph nodes so WBCs can clear them out (D)</p> Signup and view all the answers

How does the spleen filter blood, allowing it to remove damaged red blood cells and pathogens?

<p>By using specialized cells that engulf and digest pathogens and damaged cells (A)</p> Signup and view all the answers

How does the dermis contribute to thermoregulation when the body is exposed to cold temperatures?

<p>By constricting blood vessels, reducing blood flow to the skin's surface and conserving heat. (D)</p> Signup and view all the answers

Why are melanomas considered to be a serious form of skin cancer?

<p>They originate from melanocytes and have a high tendency to metastasize if not detected early. (A)</p> Signup and view all the answers

How does the subcutaneous fascia contribute to the body's ability to maintain its core temperature?

<p>It contains a layer of fat tissue, which insulates the body and reduces heat loss. (A)</p> Signup and view all the answers

How might the loss of collagen, associated with the aging process, affect the skin's ability to heal from wounds?

<p>It decreases wound healing by reducing the skin's elasticity and ability to repair itself. (A)</p> Signup and view all the answers

What is the primary role of keratin in nail health and structure?

<p>To harden and protect the nail bed as cells become keratinized. (D)</p> Signup and view all the answers

Why do individuals with chronic peripheral vascular disease sometimes experience thickening of the nails?

<p>Because of decreased blood flow and nutrient supply, affecting nail growth and structure. (C)</p> Signup and view all the answers

How does the integumentary system communicate with the hypothalamus to regulate body temperature?

<p>The hypothalamus sends messages to the skin to adjust blood vessel diameter and sweat gland activity. (D)</p> Signup and view all the answers

Which layer of the skin is responsible for generating new cells, and what specialized cells are found within it that produce skin color?

<p>Stratum basale; melanocytes (D)</p> Signup and view all the answers

How does the formation of a scab contribute to skin healing after a minor wound?

<p>It provides a barrier against pathogens and prevents further damage. (D)</p> Signup and view all the answers

How does the absence of blood vessels in the epidermis impact its function and health?

<p>It relies on diffusion from the dermis for nutrients and waste removal. (B)</p> Signup and view all the answers

How do sweat glands contribute to thermoregulation when the body is overheated?

<p>By releasing water, which evaporates and cools the skin's surface. (C)</p> Signup and view all the answers

In the context of skin injuries, what is the primary difference between minor and severe wounds in terms of the healing process?

<p>In minor wounds, the dermis regenerates, while in severe wounds, it is replaced by scar tissue. (B)</p> Signup and view all the answers

What triggers the signals that cause the capillaries to dilate in the skin when the body is too hot?

<p>Messages sent by the hypothalamus. (B)</p> Signup and view all the answers

How does the structure of the stratum corneum contribute to its protective function?

<p>It is made up of dead cells that provide a tough barrier against external factors. (B)</p> Signup and view all the answers

How does the arrangement of capillaries in the dermis support the skin's role in thermoregulation?

<p>They dilate or constrict to regulate heat loss or conservation, respectively. (B)</p> Signup and view all the answers

What role do nerve endings in the dermis play in protecting the body from harm?

<p>They sense pain, temperature, and pressure, alerting the body to potential danger. (A)</p> Signup and view all the answers

How does the increasing incidence of skin cancer as one ages relate to changes in the integumentary system?

<p>Decreased collagen and repair processes weaken the skin's defenses against DNA damage. (B)</p> Signup and view all the answers

What is one of the primary functions of sebaceous glands and where do they release their secretions?

<p>Protecting and lubricating the skin by secreting oil into hair follicles. (B)</p> Signup and view all the answers

Why might damage to capillaries within the dermis lead to both bleeding and initiate the body's clotting mechanisms?

<p>Blood contains clotting factors and flows through the dermal capillaries. (A)</p> Signup and view all the answers

How does the aging process affect hair follicles, and what outward sign does this change commonly produce?

<p>They shrink in size reducing hair thickness, sometimes leading to hair loss. (A)</p> Signup and view all the answers

Flashcards

Filtration (kidney)

The process of moving fluid and chemicals from the blood into the nephron.

Filtrate

Fluid that moves into the nephron during filtration.

Filtration Rate

How quickly fluid passes through the filter in the nephron.

Reabsorption

The process where substances move from the renal tubule back into the peritubular capillaries and the bloodstream.

Signup and view all the flashcards

Secretion

Substances move from capillaries into the renal tubule to leave in the urine.

Signup and view all the flashcards

Tubule Permeability

How easily substances pass through the walls of the tubules.

Signup and view all the flashcards

Transitional Epithelium

The only epithelium stretchy enough to expand as the bladder fills.

Signup and view all the flashcards

rugae

Series of pleats that enhance stretching of the bladder.

Signup and view all the flashcards

Urinary Tract Infection (UTI)

Movement of fecal bacteria into the urinary tract.

Signup and view all the flashcards

Digestive Tract

Also known as the alimentary tract or canal, it's a muscular tube containing the organs of digestion, starting at the mouth and ending at the anus.

Signup and view all the flashcards

Mastication

The mechanical grinding of food using teeth and tongue.

Signup and view all the flashcards

Digestion

Breaking down food into small molecules through chemical reactions.

Signup and view all the flashcards

Secretion (Digestion)

Releasing acids, enzymes, and water to aid in the breakdown of food.

Signup and view all the flashcards

Absorption (Digestion)

Food passes through the lining of digestive tract into the bloodstream.

Signup and view all the flashcards

Excretion/Defecation

Elimination of waste products.

Signup and view all the flashcards

Oral Cavity

Opening behind the mouth; includes the hard and soft palate (roof), tongue (floor), and cheeks (walls).

Signup and view all the flashcards

Uvula

Directs food toward the pharynx and blocks food from entering your nose.

Signup and view all the flashcards

Bolus

Food formed into a ball-like mass by the tongue to be swallowed.

Signup and view all the flashcards

Lingual Frenulum

A membrane under the tongue; aids in speaking

Signup and view all the flashcards

Pharynx

The three parts are: nasopharynx, oropharynx, and laryngopharynx, acts as a passageway for food, water, and air.

Signup and view all the flashcards

Epiglottis

Covers the trachea (windpipe) to prevent food from entering the lungs.

Signup and view all the flashcards

Peristalsis

Rhythmic contractions that push food down the esophagus.

Signup and view all the flashcards

Mucosa

The innermost layer of membrane lining the lumen of the alimentary canal, composed mostly of surface epithelium.

Signup and view all the flashcards

Submucosa

The layer between the mucosa and muscularis externa in the alimentary canal, composed of soft connective tissue.

Signup and view all the flashcards

Muscularis Externa

The layer next to the submucosa, composed of two layers of smooth muscle.

Signup and view all the flashcards

Serosa

The outermost layer of the alimentary canal, composed of thin layer of serous fluid producing cells.

Signup and view all the flashcards

Rugae (Stomach)

The folds in the stomach lining that allow it to expand.

Signup and view all the flashcards

Pyloric Sphincter

Ring of muscle that controls the exit of food from the stomach into the small intestine

Signup and view all the flashcards

Chyme

The thick, creamy liquid that food resembles when partially digested.

Signup and view all the flashcards

Liver

The largest glandular organ in the body, located inferior to the diaphragm.

Signup and view all the flashcards

Detoxification (by liver)

To rid the body of harmful substances like drugs and alcohol.

Signup and view all the flashcards

Bilirubin

A pigment eliminated in bile, giving feces their distinctive color.

Signup and view all the flashcards

Bile

A substance needed for the digestion of fats.

Signup and view all the flashcards

Emulsification

Process of breaking fat into tiny droplets.

Signup and view all the flashcards

Hepatic duct

Transports bile from the liver.

Signup and view all the flashcards

Gallbladder

Stores bile produced by the liver.

Signup and view all the flashcards

Cystic duct

Transports bile from the gallbladder.

Signup and view all the flashcards

Common bile duct

A duct where stored bile leaves the gallbladder to the duodenum.

Signup and view all the flashcards

Pancreas

Contains buffers and digestive enzymes and plays a role in the digestion of food.

Signup and view all the flashcards

Buffers (in pancreatic juice)

Neutralize the acidity of chyme

Signup and view all the flashcards

Vomiting

Protective mechanism to rid the digestive tract of irritants

Signup and view all the flashcards

Diarrhea

Results when fluid contents are rushed through the large intestine without water reabsorption

Signup and view all the flashcards

Constipation

Occurs when feces pass too slowly through the colon, and too much water is absorbed.

Signup and view all the flashcards

Cardiovascular System

Major structures: heart, blood, blood vessels. Purpose: transport.

Signup and view all the flashcards

Circulation

Movement to and from the heart, split into pulmonary and systemic.

Signup and view all the flashcards

Arteries

Vessels carrying blood away from the heart.

Signup and view all the flashcards

Arterioles

Smaller vessels branching from arteries.

Signup and view all the flashcards

Capillaries

Smallest vessels facilitating nutrient, gas, waste exchange.

Signup and view all the flashcards

Veins

Vessels returning blood to the heart.

Signup and view all the flashcards

Venules

Smaller vessels that form larger veins.

Signup and view all the flashcards

Fibrous Pericardium

Outer membrane layer covering the heart.

Signup and view all the flashcards

Serous Pericardium

Inner membrane layer covering the heart.

Signup and view all the flashcards

Pericardial Cavity

Space between heart membrane layers containing fluid.

Signup and view all the flashcards

Base of the Heart

Top of the heart, proximal to the head.

Signup and view all the flashcards

Apex of the Heart

Narrow, pointed part of the heart.

Signup and view all the flashcards

Right Side of Heart

Collects blood from the body; pumps to lungs.

Signup and view all the flashcards

Left Side of Heart

Pumps oxygenated blood around the body.

Signup and view all the flashcards

Atria

Upper chambers of the heart.

Signup and view all the flashcards

Ventricles

Lower chambers of the heart.

Signup and view all the flashcards

Septum

Wall separating the right and left sides of the heart.

Signup and view all the flashcards

Tricuspid Valve

Valve between right atrium and right ventricle.

Signup and view all the flashcards

Blood

Liquid connective tissue transporting oxygen and nutrients.

Signup and view all the flashcards

Hemostasis

Prevention of blood loss.

Signup and view all the flashcards

Respiratory system

Works with the cardiovascular system to circulate blood and oxygen.

Signup and view all the flashcards

Ventilation

The process of moving air in and out of the lungs.

Signup and view all the flashcards

Respiration

The exchange of oxygen and carbon dioxide in the body.

Signup and view all the flashcards

Nasopharynx

The upper section of the pharynx, behind the nasal cavity.

Signup and view all the flashcards

Oropharynx

The middle section of the pharynx, behind the oral cavity.

Signup and view all the flashcards

Laryngopharynx

The lower part of the pharynx.

Signup and view all the flashcards

Glottis

The opening into the larynx.

Signup and view all the flashcards

Bronchi

Main stem branches from the trachea.

Signup and view all the flashcards

Bronchioles

Smaller branches off the bronchi.

Signup and view all the flashcards

Nose functions

The nose filters, humidifies, heats air, and detects smells.

Signup and view all the flashcards

Sinuses

Air-filled cavities in the skull connected to the nasal cavity.

Signup and view all the flashcards

Trachea

The 'windpipe'; a large airway.

Signup and view all the flashcards

Alveoli

Small air sacs in the lungs where gas exchange occurs.

Signup and view all the flashcards

Pseudostratified ciliated columnar cells

Cells lining airways that have cilia.

Signup and view all the flashcards

Alveolar Capillary Membrane

The membrane formed by the alveoli and capillaries, where gas exchange occurs.

Signup and view all the flashcards

Mediastinum

The space in the chest containing the esophagus, heart, great vessels, and trachea separates the lungs.

Signup and view all the flashcards

Pleura

Double-layered sac surrounding each lung to prevent irritation during movement.

Signup and view all the flashcards

Pleural Fluid

Fluid within the pleura that reduces friction during breathing.

Signup and view all the flashcards

Apex (of the lung)

Superior, rounded part of the lung extending above the clavicle.

Signup and view all the flashcards

Base (of the lung)

Inferior part of the lung that rests on the diaphragm.

Signup and view all the flashcards

Hilum

Area where the root of the lung attaches; contains bronchus, vessels, nerves.

Signup and view all the flashcards

Right Lung Lobes

The right lung is divided into three sections.

Signup and view all the flashcards

Left Lung Lobes

The left lung is divided into two sections to accommodate the heart.

Signup and view all the flashcards

Bony Thorax

Protects the organs of the chest and includes the rib cage, sternum, and thoracic vertebrae.

Signup and view all the flashcards

Medulla Oblongata

The respiratory control center in the brain.

Signup and view all the flashcards

Accessory Muscles (Inspiration)

Muscles that assist in pulling up the rib cage to create a larger space in the thoracic cavity.

Signup and view all the flashcards

Exhalation

Passive process caused by the diaphragm returning to a resting state; air is pushed out.

Signup and view all the flashcards

Accessory Muscles (Exhalation)

Contraction of abdominal muscles to increase abdominal pressure. Assist forceful exhalation.

Signup and view all the flashcards

Dyspnea

Difficulty breathing.

Signup and view all the flashcards

Tachypnea

Rapid respiratory rate.

Signup and view all the flashcards

Cyanosis

Blue coloring of lips and nail beds, indicating low oxygen.

Signup and view all the flashcards

Bronchospasm

Constriction of the airways.

Signup and view all the flashcards

Hormones

Chemical substances produced by the endocrine system to maintain homeostasis.

Signup and view all the flashcards

Endocrine Glands

Glands that release hormones into the bloodstream.

Signup and view all the flashcards

Chemical Messengers

Hormones act as these, delivering messages to cells.

Signup and view all the flashcards

Bloodstream

The fluid in which hormones are released from glands.

Signup and view all the flashcards

Receptors

Attachment areas on cells where hormones bind.

Signup and view all the flashcards

Hypothalamus

A gland that controls hunger, thirst, fluid balance, and body temperature.

Signup and view all the flashcards

Growth hormone-releasing hormone (GHRH)

Hormone released by the hypothalamus that stimulates the release of growth hormone.

Signup and view all the flashcards

Growth hormone-inhibiting hormone (GHIH)

Hormone released by the hypothalamus that inhibits the release of growth hormone.

Signup and view all the flashcards

Gonadotropin-releasing hormone (GnRH)

Hormone released by the hypothalamus that controls reproductive function.

Signup and view all the flashcards

Hormonal Control

Anterior pituitary is under its hormonal control.

Signup and view all the flashcards

Antidiuretic Hormone (ADH)

A hormone that reduces urination to keep fluid in the body, secreted by the posterior pituitary.

Signup and view all the flashcards

Thyroid-stimulating Hormone (TSH)

Produced in response to low thyroid hormone levels.

Signup and view all the flashcards

Thyroid Gland

Gland in the anterior neck, shaped like a butterfly.

Signup and view all the flashcards

Thyroxine (T4) and Triiodothyronine (T3)

Two hormones released by the thyroid that increase metabolism.

Signup and view all the flashcards

Glucose

It is vital for proper cellular activities.

Signup and view all the flashcards

Insulin

Hormone released by the pancreas when blood sugar is too high.

Signup and view all the flashcards

Glucagon

Hormone released by the pancreas when blood sugar is too low.

Signup and view all the flashcards

Adrenal Glands

Located on top of the kidneys, this gland releases steroid hormones and epinephrine.

Signup and view all the flashcards

Adrenal Cortex

The outer region of the adrenal gland that releases steroid hormones.

Signup and view all the flashcards

Immune System

The body's defense system against invading organisms, involving white blood cells.

Signup and view all the flashcards

WBCs (White Blood Cells)

White blood cells that fight invaders.

Signup and view all the flashcards

Phagocytosis

The process by which WBCs engulf and destroy pathogens.

Signup and view all the flashcards

Neutrophils

WBCs that are first to arrive at the site of damage; perform phagocytosis.

Signup and view all the flashcards

Macrophages

WBCs that arrive later in infections and also perform phagocytosis

Signup and view all the flashcards

Basophils and Mast Cells

WBCs that release chemicals to promote inflammation.

Signup and view all the flashcards

Natural Killer Cells (NK cells)

WBCs that kill cells displaying foreign antigens.

Signup and view all the flashcards

T lymphocytes (T cells)

WBCs that kill pathogens and release chemicals to help with immunity; remember pathogens.

Signup and view all the flashcards

B lymphocytes (B cells)

WBCs that produce antibodies to recognize pathogens; involved in adaptive immunity.

Signup and view all the flashcards

Antigens

Molecules that identify cells as foreign or belonging to the body.

Signup and view all the flashcards

Antibodies

Proteins that detect and attach to specific pathogens.

Signup and view all the flashcards

Innate Immunity

Immunity we are born with; the first line of defense.

Signup and view all the flashcards

Adaptive Immunity

Immunity that develops after exposure to pathogens, allowing the body to recognize and respond.

Signup and view all the flashcards

Active Immunity

Immunity gained through exposure, where the body makes antibodies.

Signup and view all the flashcards

Passive Immunity

Immunity gained through antibodies from another organism.

Signup and view all the flashcards

Inflammation

The body's response to tissue damage, involving swelling, redness, and heat.

Signup and view all the flashcards

Histamine

Chemical released during tissue damage; promotes inflammation.

Signup and view all the flashcards

Cytokines

Proteins produced by damaged tissues and WBCs that stimulate the immune response.

Signup and view all the flashcards

Margination

The process where WBCs stick to the capillary walls before moving into tissues.

Signup and view all the flashcards

Diapedesis

The process where WBCs pass through the capillary walls to reach the site of damage.

Signup and view all the flashcards

Pathogens

Protects the body from infection and harmful organisms.

Signup and view all the flashcards

Lymphatic System

System that filters and cleans to maintain balance.

Signup and view all the flashcards

Lymphatic System Functions

Removes excess fluid, transports pathogens, stores WBCs, and absorbs nutrients.

Signup and view all the flashcards

Lymphatic Capillaries

Tiny vessels intertwined with blood capillaries that collect fluid.

Signup and view all the flashcards

Lymph

Fluid in the lymphatic system.

Signup and view all the flashcards

Lymphatic Vessels

Vessels that carry lymph after it leaves the lymph nodes.

Signup and view all the flashcards

Lymph Nodes

Concentrated areas that filter lymph and contain immune cells.

Signup and view all the flashcards

Lymphatic Trunks

Drain lymph into ducts.

Signup and view all the flashcards

Lymphatic Ducts

Structure where lymph re-enters the bloodstream

Signup and view all the flashcards

Cervical Lymph Nodes

Lymph nodes located in the neck region.

Signup and view all the flashcards

Axillary Lymph Nodes

Lymph nodes found in the armpit area.

Signup and view all the flashcards

Inguinal Lymph Nodes

Lymph nodes located in the groin.

Signup and view all the flashcards

Spleen

Located in the abdomen's left upper quadrant (LUQ); filters blood and removes damaged cells.

Signup and view all the flashcards

Lymph Node Function

Filters pathogens from lymph fluid.

Signup and view all the flashcards

Spleen Function

Filters and destroys damaged RBCs and pathogens in the blood.

Signup and view all the flashcards

Thymus

Gland located above the heart; matures T lymphocytes.

Signup and view all the flashcards

T Lymphocytes

White blood cells that mature in the thymus and fight infections.

Signup and view all the flashcards

Skin

The largest organ of the body, serving multiple protective and regulatory functions.

Signup and view all the flashcards

Epidermis

The outer layer of the skin composed of stratified squamous epithelium.

Signup and view all the flashcards

Stratum Corneum

The layer of the epidermis that is most superficial also known as the 'horny layer'.

Signup and view all the flashcards

Stratum Basale

The deepest layer of the epidermis, where new skin cells originate.

Signup and view all the flashcards

Melanocytes

Specialized cells in the stratum basale that produce melanin, responsible for skin color.

Signup and view all the flashcards

Melanin

A pigment produced by melanocytes that determines skin color.

Signup and view all the flashcards

Dermis

The layer of skin under the epidermis made of connective tissue containing capillaries and glands.

Signup and view all the flashcards

Subcutaneous Fascia

The deepest layer of the skin, made of elastic and fatty connective tissue.

Signup and view all the flashcards

Nails

Specialized cells that originate from the nail root and become filled with keratin.

Signup and view all the flashcards

Keratin

A hard protein that fills nail cells, making them tough and protective.

Signup and view all the flashcards

Melanoma

A malignant tumor of melanocytes, often caused by sun exposure.

Signup and view all the flashcards

Lesion

An area of tissue that has been altered by disease or injury.

Signup and view all the flashcards

Temperature regulation

Maintaining a constant body temperature.

Signup and view all the flashcards

Study Notes

  • The lymphatic and immune systems both protect the body from infection and harmful pathogens.
  • The lymphatic system is a filtration system that keeps everything clean and balanced, while the immune system is a defense system.
  • The lymphatic system is intertwined with the cardiovascular system where lymphatic capillaries intertwine with blood capillaries.
  • Lymphatic capillaries are more permeable than blood capillaries, allowing extra fluid to pass easily into the lymphatic system.
  • Lymphatic fluid, also known as lymph, flows through the lymph capillaries and the lymphatic system.

Functions of the Lymphatic System

  • Recycles extra fluid from the cardiovascular system.
  • Transports pathogens to the lymph nodes for destruction.
  • Stores some white blood cells (WBCs).
  • Aids in the absorption of some nutrients from the digestive system.

Network of the Lymphatic System

  • Lymph capillaries collect fluid.
  • Lymphatic vessels transport the fluid.
  • Lymph nodes filter the fluid.
  • Lymphatic vessels carry fluid away from nodes.
  • Lymph then flows into lymphatic trunks.
  • The lymphatic trunks empty into one of two ducts: the thoracic duct or the right lymphatic duct.
  • Ducts empty the cleaned lymph fluid back into the larger blood vessels.

Lymph Nodes

  • Lymph nodes are located in areas where they are most likely to catch invading pathogens.
  • Lymph nodes filter fluid, and the fluid leaves nodes via lymphatic vessels.
  • Lymphatic vessels empty into lymphatic trunks.
  • The lymphatic trunks empty into one of two ducts.

Organs of the Lymphatic System

  • The spleen and thymus are part of the lymphatic system and made of lymphatic tissue.

Spleen

  • The spleen is located in the left upper quadrant (LUQ) of the abdomen.
  • The spleen cleans up waste and debris.
  • The spleen filters out and destroys damaged red blood cells (RBCs) from the blood and gets rid of pathogens from the blood.

Thymus

  • The thymus is located just above the heart.
  • The thymus is large in children and gets smaller with age.
  • The thymus contains lymphocytes that mature to become T lymphocytes.

The Integumentary System

  • The skin is the largest organ in the body.
  • The skin has three main layers: epidermis, dermis, and subcutaneous fascia.

Epidermis

  • The epidermis is the superficial layer of the skin and is made of multiple layers of stratified squamous epithelium.
  • The most superficial layer of the epidermis is the stratum corneum or the "horny layer" which is made of dead cells that shed and are replaced.
  • The first layer of the epidermis is the stratum basale (basal layer) where new cells originate.
  • Melanocytes are specialized cells in the stratum basale that produce melanin, which makes skin color.
  • There are no blood vessels in the epidermis.

Dermis

  • The dermis is inferior to the epidermis, much thicker, and made of connective tissue.
  • The dermis contains capillaries, involuntary muscles, nerve endings, hair follicles, elastic fibers, sweat glands, and sebaceous (oil) glands.

Subcutaneous Fascia

  • The subcutaneous fascia is the deepest layer of skin made of elastic connective tissue and fatty tissue.
  • Fat cells make the fat that pads and protects the organs underneath.

Skin Healing

  • When skin is punctured and blood vessels are damaged, the wound fills with blood.
  • Blood contains substances that cause clotting; the top part of the clot exposed to air hardens to form a scab, preventing pathogens from entering.
  • In minor wounds, the dermis regenerates, but in severe wounds, scar tissue replaces the dermis, which is thicker and less elastic.

Nails

  • Nails are specialized cells that originate from the nail root.
  • As nails grow out and over the nail bed, they become keratinized, drying and shrinking, and filling with keratin.
  • Nails are also known as the nail body (finger and toe nails).
  • Thickening nails can be a process of aging or caused by chronic peripheral vascular disease.
  • Pink nail beds indicate normal peripheral perfusion.
  • Blue nail beds indicate a decreased level of oxygen in the tissue.
  • Peripheral perfusion indicates the amount of blood in the extremities.

Temperature Regulation

  • The integumentary system maintains body temperature, regulated by the temperature control center in the hypothalamus.
  • The hypothalamus sends messages to the integumentary system to regulate temperature.
  • When hot, signals are sent to capillaries in the skin to enlarge vessels, exposing more blood to cooler air, while sweat glands release water to cool the skin's surface.
  • When cold, signals are sent to capillaries to become smaller, keeping blood near the warm core of the body.

Common Disorders

  • Melanoma is skin cancer caused by too much sun exposure and tanning and is a malignant tumor of melanocytes.
  • A lesion means an area of tissue that has been altered.
  • Common lesions include macules (freckles), papules (pimples), and erosions (pressure ulcers).
  • Decreased collagen results in loss of skin elasticity.
  • Wound healing takes longer.
  • Hair loss occurs.
  • Nails thicken.
  • Rates of skin cancer increase.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

Related Documents

More Like This

Renal Autoregulation and Nephron Function Quiz
48 questions
Nephron Function and Filtration
10 questions
Nephron Function and Physiology Quiz
48 questions
Nephron Function and Filtration
10 questions
Use Quizgecko on...
Browser
Browser