The Cardiovascular System: The Heart Chapter 19.1 Quiz
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Questions and Answers

Which layer of the heart is the most superficial?

  • Myocardium
  • Pericardium
  • Endocardium
  • Epicardium (correct)

    • Where is the heart located within the body?

  • Near the spleen
  • Between the kidneys
  • In the pericardial cavity (correct)
  • In the pulmonary cavity

    • Which chamber of the heart is responsible for pumping blood out to the body or lungs?

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

    • How many circuits are found in the heart?

    <p>2</p> Signup and view all the answers

    Which of the following structures attaches at the base of the heart?

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

    What is the function of the auricles in the heart?

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

    What is the function of Ca++ channels at 0mV during repolarization?

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

    What is the purpose of the long refractory period in cardiac muscle?

    <p>To prevent premature contractions</p> Signup and view all the answers

    Which component of the electrocardiogram represents the repolarization of the ventricles?

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

    What is the role of troponin in muscle contraction?

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

    What is the main function of artificial pacemakers in the heart?

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

    What is the purpose of electrodes placed on the body during an electrocardiogram?

    <p>To record electrical signals of the heart</p> Signup and view all the answers

    Which layer of the heart is continuous with the lining of the blood vessels?

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

    Where does the Fossa ovalis exist?

    <p>In the interatrial septum</p> Signup and view all the answers

    Which chamber of the heart has no pectinate muscles?

    <p>Left atrium</p> Signup and view all the answers

    What ensures unidirectional blood flow in the heart?

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

    What structure closes the tricuspid and mitral valves?

    <p>Papillary muscles</p> Signup and view all the answers

    Which cells in the heart conduct impulses and contract to pump blood?

    <p>Myocardial conducting cells</p> Signup and view all the answers

    What structure is known as the pacemaker of the heart?

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

    Why do semilunar valves make an audible sound as they close?

    <p>Due to having no muscular attachments</p> Signup and view all the answers

    What happens at +30mV in cardiac contractile cells?

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

    What is the function of desmosomes in cardiac muscle cells?

    <p>Stop the muscle cells from ripping apart.</p> Signup and view all the answers

    What is the main function of myocardial contractile cells?

    <p>Conduct impulses and contract to pump blood.</p> Signup and view all the answers

    Where do coronary arteries branch off from in the heart?

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

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