Question

What is the approximate duration of a cardiac cycle?

(a) 0.1 seconds

(b) 72 seconds

(c) 1 minute

(d) 0.8 seconds

I got this question during an online exam.

This key question is from Human Circulatory System topic in section Body Fluids and Circulation of Biology – Class 11

Answer 1

The correct choice is (d) 0.8 seconds

Explanation: We know that the heart beats 70-75 times per minute. It beats approximately 72 times per minute. Hence, 72 cardiac cycles take place in one minute. Therefore, the duration of one cardiac cycle is 0.8 seconds.