L13 Cardiac Cycle
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Questions and Answers

What is the duration of the whole cardiac cycle when the heart rate is 75 beats per minute?

  • 0.8 seconds (correct)
  • 0.6 seconds
  • 1.0 seconds
  • 1.2 seconds
  • During which phase of the cardiac cycle does ventricular diastole occur?

  • Slow filling phase (correct)
  • Rapid filling phase
  • Rapid ejection phase
  • Isometric contraction phase
  • What characterizes the Atrial diastolic phase of the cardiac cycle?

  • Rapid filling phase (correct)
  • Maximal ejection phase
  • Isometric relaxation
  • Increase in ventricular pressure
  • Which ventricular phase is associated with AV valves being open and semilunar valves closed?

    <p>Isometric contraction phase</p> Signup and view all the answers

    What occurs during the Isometric (isovolumic) contraction phase of the ventricular systole?

    <p>Ventricles contract</p> Signup and view all the answers

    Which statement best describes the Atrial systolic phase?

    <p>AV valves open &amp; semilunar closed</p> Signup and view all the answers

    What is the characteristic feature of the Rapid (Maximal) ejection phase during the cardiac cycle?

    <p>AV valves closed &amp; semilunar open</p> Signup and view all the answers

    Which parameter is not monitored during the cardiac cycle?

    <p>Blood glucose level</p> Signup and view all the answers

    During the isometric (isovolumic) contraction phase, what happens to the ventricular volume?

    <p>It remains the same</p> Signup and view all the answers

    What is the characteristic heart sound during the slow (reduced) ejection phase?

    <p>No sound is heard</p> Signup and view all the answers

    What is the main function of the semilunar valves during the ejection phase?

    <p>Close to prevent backflow of blood</p> Signup and view all the answers

    Which phase marks the beginning of ventricular relaxation?

    <p>Isometric (isovolumic) relaxation phase</p> Signup and view all the answers

    What happens to the atrial pressure during the rapid (Maximal) filling phase?

    <p>It increases gradually</p> Signup and view all the answers

    What change occurs in the aortic pressure during the isometric (isovolumic) relaxation phase?

    <p>Sharp increase then decrease</p> Signup and view all the answers

    What defines the duration of the slow (Reduced) ejection phase?

    <p>0.1 sec</p> Signup and view all the answers

    Which wave is seen in the ECG during the isometric (isovolumic) relaxation phase?

    <p>'T' wave</p> Signup and view all the answers

    What happens to the ventricular pressure during the rapid (Maximal) ejection phase?

    <p>It markedly increases</p> Signup and view all the answers

    During which phase of the cardiac cycle are all valves closed?

    <p>Isometric contraction</p> Signup and view all the answers

    What is the state of the AV and semilunar valves during the rapid ejection phase?

    <p>AV valves open, semilunar valves open</p> Signup and view all the answers

    Which phase of the cardiac cycle marks the beginning of the P wave on an ECG?

    <p>Atrial systole</p> Signup and view all the answers

    What is the characteristic sound heard at the end of the second heart sound during the cardiac cycle?

    <p>S3 sound</p> Signup and view all the answers

    Which phase of the cardiac cycle is associated with a marked increase in ventricular volume?

    <p>Rapid ventricular filling</p> Signup and view all the answers

    What condition occurs when the aortic valve becomes calcified and stiff?

    <p>Aortic stenosis</p> Signup and view all the answers

    Where does the jet of blood from aortic stenosis radiate to when the stiffer valve opens?

    <p>Carotid arteries</p> Signup and view all the answers

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