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Q.

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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a

70 beats per minute

b

72 beats per minute

c

75 beats per minute

d

68 beats per minute

answer is A.

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Detailed Solution

Stroke volume = EDV – ESV = 128-63=65
Heart rate = Cardiac output / Stroke volume = 4550/63 = 70

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