NEET 2019 — Paper 2019 — Biology solution

NEET2019Paper 2019Biology

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?

A
50 beats per minute
B
75 beats per minute
C
100 beats per minute
D
125 beats per minute

Solution

Cardiac output = stroke volume × Heart rate

$\Rightarrow$ Cardiac output = 5L or 5000 ml

$\Rightarrow$ Blood volume in ventricles at the end of diastole = 100 ml

$\Rightarrow$ 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.

← Back to full paper

Practice more Biology

Concept-wise practice with instant solutions on Fundamenthol.

Start practicing →