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 ?
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.