First slide

Circulatory Pathways

Question

What would be the heart rate of a person if the cardiac output is 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricula r systole is 50 mL?

Moderate

A

125 beats per minute
B

50 beats per minute
C

75 beats per minute
D

100 beats per minute

Solution

Stroke volume $=$ End diastolic volume $-$ End systolic volume $= 100 - 50 = 50 mL$
Cardiac output $=$ stroke volume $\times$ heart rate
Heart rate $=$ cardiac output $\div$ stroke volume
$=$ $5000 mL \div 50 mL$ $=$ $100$ beats per minute

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