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

Doubtly Asked 30 Oct 2026 NEET UG 2019 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 3. 100 beats per minute

Cardiac output \(=\) stroke volume \(\times\) heart rate.

Stroke volume \(=100-50=50\) mL.

\(\text{Heart rate}=\dfrac{5000\text{ mL/min}}{50\text{ mL/beat}}=100\) beats per minute. Option 3 is correct.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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