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Solution


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            [2019]
1 125 beats per minute  
2 50 beats per minute  
3 75 beats per minute  
4 100 beats per minute  

Ans.

(4)


Stroke volume = End diastolic volume – End systolic volume
                         = 100 – 50 = 50 mL

Cardiac output = Heart beat × Stroke volume
∴  Heart beat = Cardiac output / Stroke volume
                         = 5000 / 50 = 100 beats per minute