First slide

Circulatory Pathways

Question

If the heart beats 80 times per minute, the duration of the cardiac cycle is

Moderate

A

0.7
B

0.8
C

0.75
D

0.85

Solution

Since each minute has 60 seconds, the duration of cardiac cycle = $\frac{60}{No . of beats per minute}$ = $\frac{60}{80}$ = 0.75

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