Cardiac Output Control: Frank-Starling Mechanism
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Questions and Answers

What is the main factor that determines cardiac output under normal unstressed conditions?

  • Peripheral factors that determine venous return (correct)
  • The vasomotor center of the brain
  • The sympathetic nervous system
  • The heart's pumping ability

    • What is the relationship between cardiac output and total peripheral resistance when arterial pressure is unchanged?

  • Cardiac output increases as total peripheral resistance increases
  • Cardiac output decreases as total peripheral resistance increases (correct)
  • Cardiac output is directly proportional to total peripheral resistance
  • There is no relationship between cardiac output and total peripheral resistance

    • What is the primary mechanism that regulates local blood flow in most tissues?

  • The vasomotor center of the brain
  • Tissue metabolism (correct)
  • The Bainbridge reflex
  • The sympathetic nervous system

    • What is the consequence of the returning blood exceeding the heart's pumping ability?

    <p>The heart becomes the limiting factor that determines cardiac output</p> Signup and view all the answers

    What is the sum of all the local blood flow regulations in the peripheral circulation?

    <p>Cardiac output</p> Signup and view all the answers

    What is the reflex initiated by the stretched right atrium that increases the heart rate?

    <p>The Bainbridge reflex</p> Signup and view all the answers

    What is the primary controller of cardiac output in normal conditions?

    <p>Peripheral factors affecting venous return</p> Signup and view all the answers

    What happens to the cardiac muscle when the heart chambers are stretched due to increased blood flow?

    <p>It contracts with increased force</p> Signup and view all the answers

    What is the direct effect of stretching the sinus node in the right atrium?

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

    What is the result of the Frank-Starling mechanism when increased quantities of blood flow into the heart?

    <p>The heart pumps the amount of blood that flows into it</p> Signup and view all the answers

    What determines the amount of blood pumped by the heart?

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

    What is the name of the mechanism that allows the heart to pump automatically the amount of blood that flows into it?

    <p>Frank-Starling law of the heart</p> Signup and view all the answers

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