Multiple choice

In human beings, the duration of cardiac cycle is

  1. 0·08 second

  2. 0·5 second

  3. 0·8 second

  4. 8·0 second
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C Correct answer
Explanation

The cardiac cycle lasts approximately 0.8 seconds at a normal heart rate of 75 beats per minute (60 seconds ÷ 75 beats = 0.8 seconds). This duration includes systole (contraction) and diastole (relaxation) phases. At this rate, the heart completes approximately 72 cardiac cycles per minute.

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