Exercise and Coronary Blood Flow
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Questions and Answers

During strenuous exercise, the work output of the heart increases by approximately how much?

  • 6-7 times
  • 8-9 times (correct)
  • 2-3 times
  • 4-5 times
  • What percentage of coronary blood flow is used by the heart during strenuous exercise?

  • 70-80% (correct)
  • 10-20%
  • 30-40%
  • 50-60%
  • How does sympathetic stimulation indirectly affect the work output of the heart during exercise?

  • It varies depending on the individual
  • It decreases the work output
  • It has no effect on the work output
  • It increases the work output (correct)
  • What is the primary role of sympathetic innervation in the heart?

    <p>It is unclear</p> Signup and view all the answers

    What effect does noradrenaline have on skeletal muscle arterioles?

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

    What effect does adrenaline have on skeletal muscle arterioles?

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

    Which type of receptor dominates in causing vasodilation of skeletal muscle arterioles?

    <p>β2 receptors</p> Signup and view all the answers

    What is the primary factor that increases oxygen demand during exercise?

    <p>Increased metabolic demand</p> Signup and view all the answers

    How does the closing of arterioles during systole affect the diastolic filling period during exercise?

    <p>It decreases the diastolic filling period</p> Signup and view all the answers

    Which of the following is the primary controller of coronary blood flow?

    <p>Local metabolism</p> Signup and view all the answers

    Which artery supplies blood to the walls of the left atrium and left ventricle?

    <p>Left coronary artery</p> Signup and view all the answers

    Which of the following is NOT a learning outcome for the lecture on exercise and coronary blood flow?

    <p>Understand the control of coronary blood flow</p> Signup and view all the answers

    Which part of the interventricular septum does the right coronary artery supply?

    <p>Proximal portion of AV bundle of His</p> Signup and view all the answers

    Which vein drains into the right atrium via the coronary sinus?

    <p>Great cardiac vein</p> Signup and view all the answers

    Which of the following is NOT a physiological property of the heart?

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

    What is the main topic of the lecture on cardiovascular physiology?

    <p>Circulation of blood</p> Signup and view all the answers

    Which of the following is NOT a control mechanism for blood pressure?

    <p>Respiratory rate</p> Signup and view all the answers

    Which textbook provides information on coronary blood flow?

    <p>Both Guyton and Rang and Dale’s Pharmacology</p> Signup and view all the answers

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