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In a man at rest, end diastolic volume is 128 mL, end systolic volume is 63 mL, and his cardiac output is 4,550 mL. What is his heart rate at that moment?

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70 beats per minute

72 beats per minute

75 beats per minute

68 beats per minute

answer is A.

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Detailed Solution

Stroke volume = $EDV - ESV$ = $128 - 63$ = 65
Heart rate = $\frac{Cardiac output}{Stroke volume}$ = $\frac{4550}{65}$ = 70

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