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Define a Cardiac Cycle - Biology

Define a cardiac cycle

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Solution 1

Cardiac cycle is defined as the complete cycle of events in the heart from the beginning of one heart beat to the beginning of the next. It comprises three stages – atrial systole, ventricular systole, and complete cardiac diastole

Solution 2

The sequential events in the heart which are repeated cyclically is called cardiac cycle and it consists of systole (contraction) and diastole (relaxation) of both the atria and ventricles. The duration of a cardiac cycle is 0.8 seconds. Periods of cardiac cycle are atrial systole (0.1 second), ventricular systole (0.3 second) and complete cardiac diastole (0.4 second).

Concept: Circulatory Pathways - Cardiac Cycle
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NCERT Class 11 Biology Textbook
Chapter 18 Body Fluids and Circulation
Q 12.1 | Page 289
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