Question

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, ?
(1) 50 beats per minute
(2) 75 beats per minute
(3) 100 beats per minute
(4) 125 beats per minute

Answer 1

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, the heart rate of a person would be  100 beats per minute.

Step by step explanation:

From the given,

Cardiac output = 5L  = 5000 ml

Amount of blood in ventricles at diastole end = 100 ml

Amount of blood in ventricles at systole end == 50 ml

Stroke volume = Amount of blood in ventricles at diastole end-Amount of blood in ventricles at systole end

                         = 100 -50

                         = 50 ml

            $5000\,ml=50\,ml\times heart\,rate$

        $heart\,rate=\frac{5000}{50}=100$

Therefore, The heart rate of a person would be  100 beats per minute.

Hence, correct option is 3