L3 Quiz, BMS204
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Questions and Answers

Which node is known as the pacemaker of the heart?

  • Sinoatrial node (SAN) (correct)
  • Purkinje fibers
  • Bundle of His
  • Atrioventricular node (AVN)

    • What is the approximate weight of the heart in females?

  • 250 gm (correct)
  • 320 gm
  • 200 gm
  • 300 gm

    • Which of the following is NOT a layer of the heart wall?

  • Epicardium
  • Myocardium
  • Endocardium
  • Pericardium (correct)

    • What is the function of the atrioventricular node (AVN)?

    <p>Conducts the impulse to the atrioventricular bundle</p> Signup and view all the answers

    Which of the following is NOT a type of cardiac muscle fiber?

    <p>Connective fibers</p> Signup and view all the answers

    Which of the following is NOT a function of the atria?

    <p>Pumping blood into the aorta and pulmonary artery</p> Signup and view all the answers

    What is the resting membrane potential of the sinoatrial node (SAN)?

    <p>-40 mV</p> Signup and view all the answers

    Which of the following is responsible for the self-excitation of SAN fibers?

    <p>Natural leakiness of the membrane to Na+</p> Signup and view all the answers

    What separates the atria from the ventricles?

    <p>Fibrous skeleton</p> Signup and view all the answers

    Which of the following is NOT a property of cardiac muscle?

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

    Which of the following statements about the structure of cardiac muscle is INCORRECT?

    <p>Gap junctions have high electric resistance.</p> Signup and view all the answers

    What is the significance of the slow conductivity in the atrioventricular node (AVN)?

    <p>Gives time for atria to empty blood into ventricles</p> Signup and view all the answers

    Which of the following is NOT a characteristic of Purkinje fibers?

    <p>Slow conduction velocity</p> Signup and view all the answers

    What is the effect of sympathetic stimulation on the heart rate?

    <p>Increases heart rate</p> Signup and view all the answers

    Which of the following is NOT a function of the ventricles?

    <p>Blood reservoirs during atrial systole</p> Signup and view all the answers

    What is the role of gap junctions in cardiac muscle?

    <p>Transmit electrical currents for cell-to-cell conduction</p> Signup and view all the answers

    Which of the following is NOT a factor affecting rhythmicity?

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

    What is the mechanism of parasympathetic stimulation on the sinoatrial node (SAN) rhythm?

    <p>Increases K+ efflux</p> Signup and view all the answers

    Which of the following is NOT a phase of the SAN action potential?

    <p>Plateau phase</p> Signup and view all the answers

    What is the threshold level for the membrane potential in the SAN action potential?

    <p>-40 mV</p> Signup and view all the answers

    Which of the following is NOT a component of the action potential?

    <p>Resting potential</p> Signup and view all the answers

    What is the function of the Na-K pump in repolarization?

    <p>Resumes the normal polarity and ionic distribution</p> Signup and view all the answers

    Which of the following is NOT a characteristic of the action potential?

    <p>Caused by an ineffective stimulus</p> Signup and view all the answers

    What is the main function of the fibrous skeleton of the heart?

    <p>Provides structural support and insulation</p> Signup and view all the answers

    Which of the following is NOT a characteristic of contractile muscle fibers?

    <p>Initiate and propagate the heartbeat</p> Signup and view all the answers

    What is the main function of the intercalated discs in cardiac muscle?

    <p>Facilitate cell-to-cell conduction</p> Signup and view all the answers

    Which of the following is NOT a characteristic of nodal fibers?

    <p>Responsible for the contractile function of the heart</p> Signup and view all the answers

    What is the main function of the conducting fibers in the heart?

    <p>Transmit electrical impulses throughout the heart</p> Signup and view all the answers

    Which of the following is NOT a component of the conducting system of the heart?

    <p>Chordae tendineae</p> Signup and view all the answers

    What is the significance of the vagus escape phenomena?

    <p>Prevents the heart from stopping completely under high vagal tone</p> Signup and view all the answers

    What is the function of the Na-K pump in repolarization?

    <p>Resumes the normal polarity and ionic distribution</p> Signup and view all the answers

    Which of the following is NOT a characteristic of the action potential?

    <p>Caused by an ineffective stimulus</p> Signup and view all the answers

    What is the main function of the fibrous skeleton of the heart?

    <p>Provides structural support and insulation</p> Signup and view all the answers

    Which of the following is NOT a characteristic of contractile muscle fibers?

    <p>Initiate and propagate the heartbeat</p> Signup and view all the answers

    What is the main function of the intercalated discs in cardiac muscle?

    <p>Facilitate cell-to-cell conduction</p> Signup and view all the answers

    Which of the following is NOT a characteristic of nodal fibers?

    <p>Responsible for the contractile function of the heart</p> Signup and view all the answers

    What is the main function of the conducting fibers in the heart?

    <p>Transmit electrical impulses throughout the heart</p> Signup and view all the answers

    Which of the following is NOT a component of the conducting system of the heart?

    <p>Chordae tendineae</p> Signup and view all the answers

    What is the significance of the vagus escape phenomena?

    <p>Prevents the heart from stopping completely under high vagal tone</p> Signup and view all the answers

    In the sinoatrial (SA) node, phase 4 depolarization (pacemaker potential) is attributed to:

    <p>An increase in Na+ conductance</p> Signup and view all the answers

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