The Cardiac Cycle

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The Cardiac Cycle

Whenever we hear of the word cardiac, the first thing that comes to mind is the cardiac arrest. However, the use of the word cardiac is meant to refer to the heart and below we study the cardiac cycle.


Questions and Answers
  • 1. 
    What is the definition of the Cardiac Cycle?
    • A. 

      Cardiac Cycle refers to the sequence of events that occur during one complete heartbeat

    • B. 

      The contraction of the atria

    • C. 

      The contraction and relaxation of the ventricles

    • D. 

      The circulation of blood in the heart

  • 2. 
    Name the three phases of the Cardiac Cycle in order
    • A. 

      Early Diastole, Mid-to-Late Diastole, Ventricular Systole

    • B. 

      Ventricular Systole, Mid-to-Late Diastole, Early Diastole

    • C. 

      Mid-to-Late Diastole, Ventricular Systole, Early Diastole

    • D. 

      Early Diastole, Ventricular Systole, Mid-to-Late Diastole

  • 3. 
    During the Mid-to-Late Diastole, the heart is in complete relaxation and the pressure in the heart is low.
    • A. 

      True

    • B. 

      False

  • 4. 
    During the Mid-to-Late Diastole, the ...................valves are closed.
  • 5. 
    During the Ventricular Systole, the pressure rapidly increases in the ventricles forcing the  .............. valves closed.
  • 6. 
    When is the ventricular blood volume higher?
    • A. 

      At the beginning of the systole

    • B. 

      At the beginning of the diastole

    • C. 

      During Mid-to-Late Diastole

    • D. 

      None of the above

  • 7. 
    Which of the following is NOT true for ventricular systole?
    • A. 

      The ventricles contract

    • B. 

      The atrioventricular valves close

    • C. 

      The semilunar valves open

    • D. 

      The ventricles relax

  • 8. 
    The semilunar valves close during:
    • A. 

      Ventricular systole

    • B. 

      Ventricular diastole

    • C. 

      Atrial systole

    • D. 

      Atrial diastole

  • 9. 
    The atrioventricular valves open during: 
    • A. 

      Ventricular systole

    • B. 

      Ventricular diastole

    • C. 

      Atrial diastole

    • D. 

      Both atrial and ventricular systole

  • 10. 
    Atrial contraction accounts for most of the ventricular filling
    • A. 

      True

    • B. 

      False

  • 11. 
    The ventricles begin to fill during ventricular diastole.
    • A. 

      True

    • B. 

      False

  • 12. 
    An average heartbeat, or cardiac cycle, lasts approximately:
    • A. 

      8.0 seconds

    • B. 

      80 seconds

    • C. 

      0.80 seconds

    • D. 

      0.0008 seconds

  • 13. 
    During Early Diastole, the ventricles are relaxed, the ............ valves snap shut to prevent back flow. 
  • 14. 
    A heartbeat, or cardiac cycle, is one sequence of contraction and relaxation of the heart chambers. 
    • A. 

      The contraction phase is called diastole while the relaxation phase is called systole

    • B. 

      Systole refers to both the contraction and the relaxation phase

    • C. 

      The contraction phase is called systole while the relaxation phase is called diastole

    • D. 

      Diastole refers to both the contraction and the relaxation phase

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