If the cardiac output is 5.6 L/minute and the stroke volume is 70 mL, calculate the duration of the cardiac cycle.

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0.75 sec

0.8 sec

0.7 sec

0.85 sec

answer is A.

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Detailed Solution

Cardiac output = Stroke volume x Heart rate
Heart rate = Cardiac output / Stroke volume
= 5600 / 70 = 80 bpm
Since each minute has 60 seconds,
duration of each cardiac cycle = 60/80 = 0.75 sec.

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