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NEET-XII-Biology
P1 year:2019
- #130What 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 minutedigAnsr: 3Ans : (3)
Sol. Cardiac output = stroke volume × Heart rate
&implies; Cardiac output = 5L or 5000 ml
&implies; Blood volume in ventricles at the end of
diastole = 100 ml
&implies; 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.