NEET UG BIOLOGY MCQ: BODY FLUIDS AND CIRCULATION

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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 ventricular systole is 50 mL?

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Correct option: C

100 beats per minute

Option C (100 beats per minute) is correct because stroke volume is the difference between end-diastolic and end-systolic volumes (100 mL - 50 mL = 50 mL). Cardiac output is stroke volume multiplied by heart rate, so heart rate = cardiac output / stroke volume = 5000 mL / 50 mL = 100 beats per minute.

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