Myocardial Contractility Factors Quiz
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Questions and Answers

Which factor is the primary controller of cardiac output according to the text?

  • The Heart Rate
  • Efficacy of cardiac contractility= Systolic Performance of the Ventricle
  • The Venous Return (Preload) (correct)
  • The Arterial Blood Pressure (Afterload)

    • What is the resistance against which blood is expelled called?

  • Efficacy of Cardiac Contractility
  • Venous Return
  • Afterload (correct)
  • Preload

    • Which of the following factors has a direct effect on cardiac output?

  • Peripheral Circulation Factors
  • Arterial Blood Pressure
  • Efficacy of Cardiac Contractility
  • The Heart Rate (correct)

    • What does VR stand for in the text?

    <p>Venous Return</p> Signup and view all the answers

    Which of the following would increase cardiac output if the heart rate remains unchanged?

    <p><strong>Increased stroke volume</strong></p> Signup and view all the answers

    What does SV depend on according to the text?

    <p><strong>Preload, afterload, and myocardial contractility</strong></p> Signup and view all the answers

    How does sympathetic stimulation affect myocardial contractility?

    <p>Increases the amount of Ca2+ entry into the cell</p> Signup and view all the answers

    What effect does parasympathetic stimulation have on myocardial contractility?

    <p>Decreases intracellular calcium levels</p> Signup and view all the answers

    How does a high heart rate affect contractility according to Bowditch effect?

    <p>Causes a small increase in contractility</p> Signup and view all the answers

    Which factor contributes to the increased ejection fraction during increased strength of contraction?

    <p>Increase in fiber strength without fiber length increase</p> Signup and view all the answers

    What contributes to the force-frequency relation known as the Bowditch effect?

    <p>Slower Ca2+ entry into the cell than sequestration by sarcoplasmic reticulum</p> Signup and view all the answers

    How do circulating catecholamines affect myocardial contractility?

    <p>Augment the positive inotropic effect of norepinephrine</p> Signup and view all the answers

    What is the role of valves in the veins?

    <p>Prevent backflow of blood in the veins</p> Signup and view all the answers

    How does arteriolar dilatation affect blood flow?

    <p>Decreases resistance to blood flow</p> Signup and view all the answers

    What effect does severe capillary dilatation have on circulatory shock?

    <p>Leads to pooling of blood in the capillaries</p> Signup and view all the answers

    How does the respiratory pump aid venous return?

    <p>Dilates thoracic veins and decreases resistance to blood flow</p> Signup and view all the answers

    How does sympathetic stimulation affect venous return?

    <p>Increases the venous tone and cardiac suction forces</p> Signup and view all the answers

    What is the role of venomotor tone in peripheral circulation?

    <p>Maintains partial constriction of venules during rest</p> Signup and view all the answers

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