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  4. 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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Q. 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 ?

NEETNEET 2019Body Fluids and Circulation

Solution:

Cardiac output = stroke volume $\times $ Heart rate
$\Rightarrow $ Cardiac output = 5L or 5000 ml
$\Rightarrow $ Blood volume in ventricles at the end of diastole = 100 ml
$\Rightarrow $ Blood volume in ventricles at the end of systole = 50 ml
Stroke volume = 100 - 50
= 50 ml.
So,
5000 ml = 50 ml $\times$ Heart rate
So, Heart rate = 100 beats per minute.