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Anatomy of the Heart - Cardiovascular System
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Anatomy of the Heart - Cardiovascular System

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Questions and Answers

What is the main function of the pericardial cavity?

  • To protect and anchor the heart
  • To allow for the heart to work in a relatively friction-free environment (correct)
  • To store blood during high-pressure conditions
  • To regulate the heartbeat
  • Which of the following vessels conveys blood away from the heart?

  • Pulmonary trunk (correct)
  • Right pulmonary veins
  • Superior venae cavae
  • Left pulmonary artery
  • What is the outermost layer of the heart wall?

  • Myocardium
  • Endocardium
  • Fibrous skeleton
  • Epicardium (correct)
  • What is the function of the fibrous pericardium?

    <p>To prevent overfilling of the heart with blood</p> Signup and view all the answers

    Which of the following vessels returns blood to the heart?

    <p>Superior venae cavae</p> Signup and view all the answers

    What is the innermost layer of the heart wall?

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

    Which of the following vessels is not responsible for supplying the heart with oxygenated blood?

    <p>Superior vena cava</p> Signup and view all the answers

    What is the primary function of the atrioventricular (AV) valves in the heart?

    <p>To prevent backflow of blood into the ventricles</p> Signup and view all the answers

    Which of the following statements is true about the path of blood through the heart and lungs?

    <p>Blood flows from the right atrium to the right ventricle to the pulmonary arteries</p> Signup and view all the answers

    What is the main function of the coronary circulation?

    <p>To provide a functional blood supply to the heart muscle itself</p> Signup and view all the answers

    Which of the following valves lies between the left ventricle and the aorta?

    <p>Aortic semilunar valve</p> Signup and view all the answers

    What is the approximate volume of blood in an individual weighing 154 pounds?

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

    What is the primary function of the lymph nodes in the lymphatic system?

    <p>To filter and clean the lymph before returning it to the blood</p> Signup and view all the answers

    What percentage of the total blood volume is composed of blood plasma?

    <p>55%</p> Signup and view all the answers

    Which of the following is not a function of blood?

    <p>Regulating body temperature</p> Signup and view all the answers

    What is the correct pathway of blood from the lungs to the heart?

    <p>Lungs → pulmonary veins → left atrium</p> Signup and view all the answers

    What is the term for the fluid that occupies the space between all cells of the body?

    <p>Interstitial fluid</p> Signup and view all the answers

    What is the primary function of the spleen in the lymphatic system?

    <p>To remove old red blood cells from the blood supply</p> Signup and view all the answers

    What is the percentage of water in lymph?

    <p>95%</p> Signup and view all the answers

    What is the function of the tonsils in the lymphatic system?

    <p>To filter bacteria and produce white blood cells</p> Signup and view all the answers

    How does the lymph move through the lymphatic system?

    <p>Through both skeletal muscle action and respiratory movement</p> Signup and view all the answers

    What is the primary function of the white pulp of the spleen?

    <p>To remove, store and produce white blood cells</p> Signup and view all the answers

    Study Notes

    Heart Anatomy

    • The heart is approximately the size of a fist
    • Located on the superior surface of the diaphragm, left of the midline, and anterior to the vertebral column, posterior to the sternum
    • Coverings of the heart:
      • Pericardium: a double-walled sac around the heart
      • Fibrous pericardium: a superficial layer
      • Serous pericardium: a deep two-layer layer (parietal and visceral layers)
      • Pericardial cavity: a fluid-filled space between the parietal and visceral layers

    Function of the Pericardium

    • Protects and anchors the heart
    • Prevents overfilling of the heart with blood
    • Allows for the heart to work in a relatively friction-free environment

    Heart Wall

    • Epicardium: visceral layer of the serous pericardium
    • Myocardium: cardiac muscle layer forming the bulk of the heart
    • Fibrous skeleton of the heart: a layer of connective tissue
    • Endocardium: endothelial layer of the inner surface of the heart

    External Heart: Major Vessels

    • Vessels returning blood to the heart:
      • Superior and inferior venae cavae
      • Right and left pulmonary veins
    • Vessels conveying blood away from the heart:
      • Pulmonary trunk (splits into right and left pulmonary arteries)
      • Ascending aorta

    External Heart: Vessels that Supply/Drain the Heart

    • Arteries: mainly coronary arteries
    • Veins: small cardiac, anterior cardiac, and great cardiac veins

    Atria and Ventricles

    • Atria: receiving chambers of the heart
    • Blood enters right atria from superior and inferior venae cavae and coronary sinus
    • Blood enters left atria from pulmonary veins
    • Ventricles: discharging chambers of the heart
    • Right ventricle pumps blood into pulmonary arteries
    • Left ventricle pumps blood into the aorta

    Pathway of Blood Through the Heart and Lungs

    • Right atrium → tricuspid valve → right ventricle
    • Right ventricle → pulmonary semilunar valve → pulmonary arteries → lungs
    • Lungs → pulmonary veins → left atrium
    • Left atrium → bicuspid valve → left ventricle
    • Left ventricle → aortic semilunar valve → aorta
    • Aorta → systemic circulation

    Coronary Circulation

    • Functional blood supply to the heart muscle itself

    Heart Valves

    • Ensure unidirectional blood flow through the heart
    • Atrioventricular (AV) valves: prevent backflow into the atria when ventricles contract
    • Semilunar valves: prevent backflow of blood into the ventricles
    • Aortic semilunar valve: lies between the left ventricle and the aorta
    • Pulmonary semilunar valve: lies between the right ventricle and pulmonary trunk

    Blood and Lymph System

    • Blood: a fluid consisting of formed elements and plasma
    • Produced by bone marrow
    • Volume depends on body weight (approximately 5 quarts/liters for a 154-pound individual)
    • Functions: transportation of respiratory gases, chemicals, and cells that protect the body from foreign substances

    Vascular Tree

    • Hierarchical network of arteries, arterioles, capillary beds, veins, and venules
    • Characterized by an inner layer of endothelium and an outer layer of basement membrane

    Blood Plasma

    • Fluid part of the blood (55% of total blood volume)
    • Clear or straw-colored
    • Composed mostly of water and proteins

    Lymph

    • Clear, nearly colorless, alkaline fluid
    • Occupies the space between all cells of the body (interstitial fluid)
    • 95% water
    • Seeps in and out through the walls of capillaries
    • Mostly fluid from blood plasma

    Lymphatic System

    • Connected to the circulatory system
    • Consists of capillaries, vessels, ducts, and nodes
    • Transports lymph one-way back to the bloodstream
    • No pump, but lymph moves via skeletal muscle action, respiratory movement, and contraction of smooth muscle in vessel walls

    Lymph Nodes

    • Filters, slowing down and cleaning the lymph before returning it to the blood

    Accessory Organs to the Lymphatic System

    • Spleen:
      • Removes old red blood cells from the blood supply
      • Removes, stores, and produces white blood cells
    • Tonsils:
      • Filter bacteria and produce white blood cells

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    Description

    Learn about the anatomy of the heart, its location, and coverings. Understand the structure of the pericardium and its layers.

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