The Cardiovascular System: The Heart Chapter 19 - Heart Anatomy
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Questions and Answers

What is the volume of fluid that the heart pumps per minute?

  • 5.25 L (correct)
  • 8 L
  • 1 L
  • 3 L

    • Where is the heart located?

  • Between the kidneys
  • Behind the liver
  • In the abdominal cavity
  • In a space called mediastinum (correct)

    • Which chamber of the heart connects to the pulmonary trunk?

  • Right atrium
  • Left ventricle
  • Right ventricle (correct)
  • Left atrium

    • What is the function of the atria in the heart?

    <p>Collect blood and push it into lower chambers</p> Signup and view all the answers

    Which layer of the heart is described as the 'middle thickest layer'?

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

    Which of the following vessels is the only artery to carry deoxygenated blood?

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

    What happens at 0mV in terms of ion channels?

    <p>Ca++ channels close and K+ channels open</p> Signup and view all the answers

    What is the role of Ca++ in muscle contraction?

    <p>Ca++ binds to troponin to allow myosin and actin cross bridge</p> Signup and view all the answers

    At what rate would the AV node fire if not for endocrine control?

    <p>40 - 60 times per minute</p> Signup and view all the answers

    What is the function of an Artificial Pacemaker?

    <p>Deliver electrical impulses for effective heart contractions</p> Signup and view all the answers

    Which part of the ECG represents the repolarization of the ventricles?

    <p>T wave</p> Signup and view all the answers

    What is the purpose of Abbreviated ECG or EKG with 12 leads?

    <p>To monitor electrical signals of the heart more comprehensively</p> Signup and view all the answers

    What is the function of endothelins released by the endothelium?

    <p>Regulating growth patterns of cardiac muscle cells</p> Signup and view all the answers

    Which valves separate the atria from the ventricles?

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

    What is the function of the moderator band?

    <p>Assists in cardiac conduction</p> Signup and view all the answers

    What is the purpose of the fossa ovalis?

    <p>Allow blood flow during fetal circulation</p> Signup and view all the answers

    Which of the following statements is true about coronary circulation?

    <p>Arteries branch off the aorta near the ventricles.</p> Signup and view all the answers

    What is the primary function of myocardial conducting cells?

    <p>Initiate and propagate action potentials through the heart</p> Signup and view all the answers

    Where are T tubules found in cardiac muscle cells?

    <p>At Z discs</p> Signup and view all the answers

    What is the role of desmosomes in cardiac muscle cells?

    <p>Prevent cardiac muscle cells from separating</p> Signup and view all the answers

    What is the function of Purkinje fibers in the heart?

    <p>Conduct impulses throughout the ventricles</p> Signup and view all the answers

    What occurs during the plateau phase in cardiac contractile cells?

    <p>Sarcoplasmic reticulum releases Ca++</p> Signup and view all the answers

    What is the main function of the Bundle of His?

    <p>Impulse conduction to ventricles</p> Signup and view all the answers

    What is an essential role of gap junctions in cardiac muscle?

    <p>Ion exchange between cells</p> Signup and view all the answers

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