Human Anatomy Class Quiz
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Questions and Answers

What is the primary function of antibodies?

  • To prevent infection (correct)
  • To facilitate digestion
  • To transport oxygen in the blood
  • To regulate blood pressure

    • The process of hemostasis involves vascular spasms and the formation of a platelet plug.

    True

    What is the time frame within which a blood clot typically forms?

    3-6 minutes

    A thrombus is a clot in an __________ blood vessel.

    <p>unbroken</p> Signup and view all the answers

    Match the following blood disorders with their descriptions:

    <p>Embolus = Clot that breaks away and floats freely Thrombus = Clot that forms in an unbroken blood vessel Hemophilia = Hereditary bleeding disorder due to lack of clotting factors</p> Signup and view all the answers

    What does agglutination refer to in the context of blood?

    <p>Clumping caused by antibodies binding to antigens</p> Signup and view all the answers

    Haemophilia A is characterized by low levels of factor 8.

    <p>True</p> Signup and view all the answers

    Describe the location of the heart within the body.

    <p>It is located in the thorax between the lungs at the mediastinum.</p> Signup and view all the answers

    Which node is primarily responsible for initiating the heartbeat?

    <p>Sinoatrial (SA) node</p> Signup and view all the answers

    The cardiac cycle consists of three main phases: diastole, systole, and isometric contraction.

    <p>False</p> Signup and view all the answers

    What is the average stroke volume for an adult heart?

    <p>70 ml</p> Signup and view all the answers

    The heart pumps approximately _____ liters of blood per minute at rest.

    <p>5</p> Signup and view all the answers

    Match the cardiac cycle phases with their definitions:

    <p>Atrial Systole = Atrial contraction occurs. Ventricular Systole = Ventricular contraction occurs. Early Ventricular Diastole = Ventricles start to refill with blood. Late Ventricular Diastole = Final blood filling of ventricles occurs. Early Ventricular Systole = Initially, ventricles begin to contract.</p> Signup and view all the answers

    What is calculated by multiplying heart rate by stroke volume?

    <p>Cardiac Output</p> Signup and view all the answers

    During exercise, stroke volume decreases to supply more oxygen to the body.

    <p>False</p> Signup and view all the answers

    What is the Bundle of HIS also known as?

    <p>Atrioventricular bundle</p> Signup and view all the answers

    What is the primary function of the pericardium?

    <p>To secrete lubricating fluids</p> Signup and view all the answers

    The left atrium receives blood from the right atrium.

    <p>False</p> Signup and view all the answers

    Name the valves located between the atria and ventricles.

    <p>Bicuspid valve and Tricuspid valve</p> Signup and view all the answers

    The _________ system is responsible for the intrinsic conduction of the heart.

    <p>nodal</p> Signup and view all the answers

    Match the following heart chambers to their functions:

    <p>Right atrium = Receives deoxygenated blood from the body Left atrium = Receives oxygenated blood from the lungs Right ventricle = Pumps deoxygenated blood to the lungs Left ventricle = Pumps oxygenated blood to the body</p> Signup and view all the answers

    Which of the following structures prevent blood from flowing back into the atria during ventricular contraction?

    <p>Atrioventricular valves</p> Signup and view all the answers

    The aorta carries deoxygenated blood away from the heart.

    <p>False</p> Signup and view all the answers

    What is the function of the coronary arteries?

    <p>To nourish the myocardium</p> Signup and view all the answers

    What is the primary function of the tunica media in blood vessels?

    <p>Regulates blood vessel diameter</p> Signup and view all the answers

    Diastolic pressure refers to the pressure of the blood during heart contraction.

    <p>False</p> Signup and view all the answers

    What are the two main types of blood circulation?

    <p>Pulmonary and Systemic</p> Signup and view all the answers

    The outermost layer of a blood vessel is called the ______.

    <p>tunica externa</p> Signup and view all the answers

    Which measurement indicates the pressure of blood during heart contraction?

    <p>Systolic pressure</p> Signup and view all the answers

    Baroreceptors are located in the veins and arteries.

    <p>False</p> Signup and view all the answers

    Match the following terms with their definitions:

    <p>Tunica intima = Inner layer of blood vessels Systolic pressure = Pressure during heart contraction Baroreceptors = Sensors that detect blood pressure changes Tunica externa = Outermost layer with connective fibers</p> Signup and view all the answers

    What component of the autonomic nervous system is involved in short-term blood pressure regulation?

    <p>Efferent parasympathetic fibers (vagus nerve)</p> Signup and view all the answers

    What is the primary role of the thymus in the lymphatic system?

    <p>It stores and prepares immature lymphocytes to become T cells.</p> Signup and view all the answers

    The lymphatic system is a closed circulatory system.

    <p>False</p> Signup and view all the answers

    What fluid collects in the lymph vessels?

    <p>lymph</p> Signup and view all the answers

    The tonsils are known as the body's ______ line of defense.

    <p>first</p> Signup and view all the answers

    Match the following components of the lymphatic system with their functions:

    <p>Thymus = Prepares T cells Tonsils = First line of defense Lacteals = Absorb fats and vitamins Lymph = Fluid in lymph vessels</p> Signup and view all the answers

    What triggers the release of renin from the juxtaglomerular apparatus?

    <p>Sympathetic stimulation</p> Signup and view all the answers

    Baroreceptors are capable of regulating blood pressure in the long-term.

    <p>False</p> Signup and view all the answers

    What is the primary effect of angiotensin II on the kidneys?

    <p>Increase sodium reabsorption</p> Signup and view all the answers

    The hormone that promotes salt and water retention is called _____

    <p>aldosterone</p> Signup and view all the answers

    Match the following hormones with their corresponding functions:

    <p>Renin = Converts angiotensinogen to angiotensin I Angiotensin II = Potent vasoconstrictor Aldosterone = Increases sodium and water retention ADH = Increases water reabsorption in kidneys</p> Signup and view all the answers

    Which of the following substances is broken down by ACE?

    <p>Bradykinin</p> Signup and view all the answers

    Anti-Diuretic Hormone (ADH) is produced in the posterior pituitary gland.

    <p>False</p> Signup and view all the answers

    What physiological system is primarily involved in long-term blood pressure regulation?

    <p>Renin-angiotensin-aldosterone system (RAAS)</p> Signup and view all the answers

    Study Notes

    Cardiovascular System Overview

    • The cardiovascular system is a closed system of the heart and blood vessels.
    • The heart pumps blood.
    • Blood vessels allow blood to circulate to all parts of the body.
    • The cardiovascular system delivers oxygen and nutrients, and removes carbon dioxide and other waste products.

    Blood Components

    • Blood is composed of 55% plasma and 45% cells.
    • Plasma is 90% water, with ions, proteins, gases, nutrients, wastes, and hormones.
    • Blood cells include red blood cells (RBCs), white blood cells (WBCs), and platelets.
    • RBCs develop from stem cells in bone marrow.
    • WBCs defend against infection and tumors.
    • Platelets are cell fragments needed for blood clotting.

    Blood Cell Formation

    • Haematopoiesis is blood cell formation.
    • It occurs in red bone marrow.
    • Bone marrow locations include skull, pelvis, ribs, sternum, humerus, and femur.

    Erythrocytes (Red Blood Cells)

    • RBCs transport oxygen in the blood.
    • They are biconcave discs, anucleate (no nucleus), and contain hemoglobin (iron-containing protein that binds to oxygen).
    • RBC lifespan is 100-120 days.

    Common Health Problems with RBCs

    • Anemia: decrease in oxygen-carrying ability of blood, often due to low RBC count or deficient hemoglobin content.
    • Sickle-cell disease: abnormal hemoglobin, a genetic disorder.

    Leukocytes (White Blood Cells)

    • WBCs defend against infection and tumors.
    • They locate areas of tissue damage by responding to chemicals.
    • WBC types include neutrophils, eosinophils, basophils, lymphocytes, and monocytes.
    • Lymphocytes (T-cells, B-cells, NK cells) are important for immune function.

    Common Health Problem with WBCs

    • Leukemia: bone marrow cancer, characterized by an abnormal amount of WBCs.
    • Treatment includes chemotherapy, radiotherapy, and stem cell transplant.

    Platelets

    • Platelets are cell fragments that are irregularly shaped.
    • They are needed for blood clotting.

    Functions of Blood

    • Deliver oxygen and nutrients to body cells.
    • Transport waste products from cells for elimination.
    • Transport hormones.
    • Maintain body temperature.
    • Maintain blood pH (using buffers).
    • Maintain blood volume.
    • Prevent blood loss (through clotting).
    • Prevent infection (through WBCs and antibodies).

    Hemostasis: Stoppage of Bleeding

    • Vascular spasm: constrict damaged blood vessels.
    • Platelet plug: platelets stick to damaged site and release chemicals to attract more platelets.
    • Coagulation: fibrin threads form a mesh that traps RBCs, leading to blood clotting.
    • Clotting time: typically 3–6 minutes.

    Clotting Factors

    • The process involves various factors including fibrinogen, prothrombin, thromboplastin, and calcium ions.
    • Several other clotting factors are involved and are identified with Roman numerals (I to XIII).

    Blood Clotting Disorders

    • Thrombus: blood clot in unbroken blood vessel.
    • Embolus: a thrombus that breaks away and floats freely.
    • Stroke (cerebral embolus).
    • Heart attack (coronary thrombosis).
    • Hemophilia: hereditary bleeding disorder, caused by lacking clotting factors.

    Human Blood Groups

    • Antigens: foreign substances that trigger an immune response.
    • Antibodies: Y-shaped proteins secreted by WBCs that attach to antigens.
    • Agglutination: clumping caused by antibodies binding to antigens on RBCs.
    • ABO blood grouping: based on A, B, and O antigens, with corresponding antibodies.
    • Rh factor: another system of human blood groups, which also has antibodies.

    ABO Blood Grouping (Details)

    • Blood types are identified by the presence or absence of A and B antigens on red blood cells (RBCs) .
    • Plasma contains antibodies (i.e. anti-A, anti-B) that react with the opposing antigens.
    • Different blood types have different combinations of antigens and antibodies.
    • O is the most common blood type in the world.

    Rh(+/-) Blood Grouping (Details)

    • Rh factor (also known as RhD) is another system of human blood groups, with antibodies.
    • Rh-positive individuals have RhD antigens.
    • Rh-negative individuals lack RhD antigens.
    • Hemolytic disease of the newborn can occur if an Rh-negative mother carries an Rh-positive fetus.

    Heart Structure and Organization

    • Location: thorax, between the lungs, in the mediastinum, with apex pointing to the left, around the 5th intercostal muscle
    • Size: about the size of a fist
    • Wall structure: fibrous pericardium (outer), serous pericardium (middle), pericardial fluid (inner), myocardium (muscle layer), endocardium (inner lining).
    • Chambers: four – two atria (receiving chambers), two ventricles (discharging chambers).
    • Heart valves: atrioventricular valves (tricuspid right, mitral/bicuspid left) and semilunar valves (pulmonary and aortic).

    Operation of Heart Valves

    • Flapping leaflets act as one-way inlets and outlets.
    • Papillary muscles and chordae tendineae prevent backflow.

    Heart Associated Great Vessels

    • Aorta: leaves the left ventricle, carries oxygenated blood to the body.
    • Pulmonary arteries: leave the right ventricle, carry deoxygenated blood to the lungs
    • Vena cava: enters the right atrium, carries deoxygenated blood from the body
    • Pulmonary veins: enter the left atrium, carry oxygenated blood from the lungs.

    Coronary Circulation

    • The heart has its own nourishing circulatory system.
    • Coronary arteries supply blood to the myocardium.
    • Cardiac veins drain blood away from the myocardium.
    • Blood empties into coronary sinus, which empties into the right atrium.

    Cardiac Cycle

    • Diastole: heart muscle relaxes and refills wtih blood.
    • Systole: contraction and pumping of blood.
    • Five phases: atrial systole, early ventricular systole, ventricular systole, early ventricular diastole, and late ventricular diastole.

    Cardiac Output

    • The amount of blood pumped by the heart each minute.
    • It's different for individuals, depending on body size, which also takes into account the amount of blood pumped with each beat.
    • Normal resting values vary but is around 5 liters per minute.
    • Activities such as running can multiply cardiac output significantly.

    Stroke Volume (SV)

    • Stroke volume is the volume of blood pumped by each ventricle during each heart contraction (systole).
    • SV is the difference between end diastolic volume (EDV) and end systolic volume (ESV).
    • Normal SV is approximately 70 ml.

    Regulation of Heart Rate and Volume

    • Heart rate increases during exercise, to efficiently distribute more oxygenated blood to the body.
    • Stroke volume can increase if the heart contracts more forcefully.
    • Stroke volume also increases if the amount of blood that fills the left ventricle before pumping is higher.

    Blood Vessel Structure and Function

    • Blood vessels have three layers: tunica intima (inner), tunica media (middle), and tunica externa (outer).
    • Arteries carry blood away from the heart; have thick walls and narrow lumina (inside diameters).
    • Veins carry blood to the heart; have thinner walls and wider lumina (inside diameters).
    • Capillaries are extremely thin-walled (one cell layer) and are responsible for material exchange.

    Differences Between Blood Vessels (summary)

    • Arteries have thick walls, high pressure, narrow lumina, no valves, and large amounts of muscle and elastic fibres..
    • Veins have thin walls, low pressure, wide lumina, and valves.
    • Capillaries are extremely thin-walled, have very low pressure, and have extremely narrow lumina, and no valves and lacks significant muscle or elastic fibers

    Blood Circulation (Pulmonary and Systemic)

    • Pulmonary circulation: carries deoxygenated blood to the lungs and returns oxygenated blood to the heart.
    • Systemic circulation: carries oxygenated blood to the body's tissues and returns deoxygenated blood to the heart.

    Lymphatic System

    • Components: lymphatic vessels, lymph nodes, lymphatic organs (tonsils, adenoids, spleen, thymus).
    • Functions: return leaked blood to the bloodstream, part of the immune system (forming lymphocytes, filtering fluid for pathogens), helping with digestion absorption of fat.
    • Circulation: lymphatic fluid moves through the lymphatic vessels (similar to veins).
    • Lymph nodes (filters): located throughout the body.
    • Drainage: lymph flows into lymphatic duct(s), which drain into veins near the heart.

    Long-Term Blood Pressure Regulation

    • Renin-angiotensin-aldosterone system (RAAS): regulates blood volume by increasing reabsorption of sodium and water.
    • Antidiuretic hormone (ADH): increases water reabsorption in the kidneys, increasing blood volume and raising blood pressure.
    • Other factors include natriuretic peptides (ANP), which promote sodium excretion, and prostaglandins, which act as vasodilators to control blood pressure, alongside nerve stimulation for blood pressure control.

    Short-Term Blood Pressure Regulation

    • Baroreceptors (in arch of aorta and carotid sinus) sense blood pressure changes.
    • ANS (autonomic nervous system) regulates heart rate and cardiac contractility, responding according to changes in pressure.
    • Increased arterial pressure: detected by baroreceptors.
      • This triggers parasympathetic fibers (vagus nerve) to reduce heart rate, lowering blood pressure.
    • Decreased arterial pressure: detected by receptors.
      • This triggers sympathetic response to increase heart rate, increasing blood pressure.

    Additional Notes

    • Various diagrams are included for understanding the processes involved in different systems.

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    GCSF 2013 Human Structure & Function PDF

    Description

    Test your knowledge on human anatomy with this quiz, covering essential topics such as the functions of antibodies, blood clotting processes, and the cardiac cycle. Answer questions about heart structure and related disorders to deepen your understanding of cardiovascular health.

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