Cardiorespiratory System Overview
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Questions and Answers

What contributes to the increase in cardiac output during exercise in the upright position?

  • No change in either stroke volume or heart rate
  • Decrease in both stroke volume and heart rate
  • Increase in stroke volume (correct)
  • Decrease in heart rate
  • At what workload does stroke volume not appreciably increase in untrained or moderately trained individuals?

  • 10% - 20% VO2max
  • 70% - 80% VO2max
  • 40% - 60% VO2max (correct)
  • 30% - 40% VO2max
  • How is the rise in cardiac output achieved at work rates greater than 40% - 60% VO2max in untrained or moderately trained individuals?

  • Increases in heart rate alone (correct)
  • No change in cardiac output
  • Decreases in heart rate alone
  • Increase in stroke volume alone
  • For whom are the examples of maximal heart rate, stroke volume, and cardiac output provided?

    <p>Untrained or moderately trained college-age males</p> Signup and view all the answers

    During maximal exercise, how is the distribution of cardiac output altered compared to rest?

    <p>Redistributed to non-active tissues</p> Signup and view all the answers

    At what point does stroke volume significantly increase during exercise?

    <p>Beyond 60% VO2max</p> Signup and view all the answers

    How does cardiac output rise during exercise beyond a certain intensity in untrained individuals?

    <p>Mainly through an increase in heart rate alone</p> Signup and view all the answers

    'Redistribution of blood flow during exercise' refers to:

    <p>'An alteration of blood flow from active to non-active tissues during exercise'</p> Signup and view all the answers

    'Redistribution of blood flow during maximal exercise' implies that:

    <p>'Blood flow increases compared to rest'</p> Signup and view all the answers

    'Distribution of cardiac output during rest' indicates that:

    <p>'Cardiac output is distributed equally among tissues during rest'</p> Signup and view all the answers

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