Class 11 NEET Biology Body Fluids and Circulation

Cardiac output = stroke volume × Heart rate
⇒ Cardiac output = 5L or 5000 ml
⇒ Blood volume in ventricles at the end of diastole = 100 ml
⇒ Blood volume in ventricles at the end of systole = 50 ml
Stroke volume = 100 – 50
= 50 ml.
So,
5000 ml = 50 ml × Heart rate
So, Heart rate = 100 beats per minute.