The Cardiac Cycle
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The Cardiac Cycle

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Questions and Answers

During which phase of the cardiac cycle do the two atria contract simultaneously?

  • Isovolumetric Ventricular Contraction
  • Ejection
  • Atrial Systole (correct)
  • Isovolumetric Ventricular Relaxation
  • Which valves are open during the Atrial Systole phase?

  • Both AV and SL valves
  • SL valves
  • Neither AV nor SL valves
  • AV valves (correct)
  • What is the purpose of the Isovolumetric Ventricular Contraction phase?

  • To increase intraventricular pressure (correct)
  • To open the AV valves
  • To eject blood from the heart
  • To close the SL valves
  • When do the SL valves open during the cardiac cycle?

    <p>During the Ejection phase</p> Signup and view all the answers

    What is residual volume?

    <p>The considerable amount of blood left in the ventricles</p> Signup and view all the answers

    When do the SL valves close during the cardiac cycle?

    <p>When ventricular pressure drops below arterial pressure</p> Signup and view all the answers

    What is the purpose of measuring blood flow, pressure changes, and blood volume throughout the phases of the cardiac cycle?

    <p>To monitor the efficiency of the heart</p> Signup and view all the answers

    How many major events make up the cardiac cycle?

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

    Which wave of an ECG marks the beginning of the Atrial Systole phase?

    <p>P wave</p> Signup and view all the answers

    What coincides with the onset of ventricular systole?

    <p>R wave of the ECG</p> Signup and view all the answers

    Study Notes

    Cardiac Cycle Phases

    • The two atria contract simultaneously during the Atrial Systole phase.

    Valves During Atrial Systole

    • The AV valves (tricuspid and mitral) are open during the Atrial Systole phase.

    Isovolumetric Ventricular Contraction

    • The purpose of the Isovolumetric Ventricular Contraction phase is to build pressure in the ventricles.

    SL Valves and Cardiac Cycle

    • The SL (semilunar) valves open during the Ventricular Ejection phase.
    • The SL valves close at the end of the Ventricular Ejection phase.

    Residual Volume

    • Residual volume is the amount of air remaining in the lungs after exhalation.

    Purpose of Cardiac Cycle Measurements

    • Measuring blood flow, pressure changes, and blood volume throughout the phases of the cardiac cycle helps to understand cardiac function and diagnose cardiovascular diseases.

    Cardiac Cycle Events

    • The cardiac cycle consists of 5-7 major events.

    ECG and Atrial Systole

    • The P wave of an ECG marks the beginning of the Atrial Systole phase.

    Ventricular Systole

    • The QRS complex of an ECG coincides with the onset of ventricular systole.

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    Description

    Test your knowledge about the cardiac cycle with this quiz! Learn about the events of contraction and relaxation in the atria and ventricles, and understand how blood flow, pressure changes, and blood volume are measured during each phase.

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