Q12  Define a cardiac cycle and the cardiac output.

Answers (1)

Cardiac Cycle:

  • The circulation of blood in the heart occurs because of the alternate contraction and relaxation of the heart chambers and the contraction is also known as systole, while relaxation is known as diastole.
  • Each contraction phase (systole) is followed by a relaxation or expansion phase (diastole).
  • The series of events which occur during one complete beat of the heart is called the cardiac cycle and the duration of one cardiac cycle is 0.8 seconds.

Cardiac Output:

  • The amount of blood pumped by each ventricle per minute is called the cardiac output.

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