Question

The duration of cardiac cycle is

• A. 0.8 sec
• B. 0.8 $\mu$ sec
• C. 0.08 sec
• D. 0.008 sec

Answer 1

The correct option is A 0.8 sec

The cardiac cycle consists of a period of relaxation called diastole, during which the heart fills with blood, followed by a period of contraction called as systole. The total duration of the cardiac cycle, including systole and diastole, is the reciprocal of the heart rate. For example, if heart rate is 72 beats/min, the duration of the cardiac cycle is 1/ 72 beats/ min about 0.0139 minutes per beat, or 0.8 second per beat.