NEET 2019 · BiologyPrevious Year 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?
Answer: (C) 100 beats per minute. Answer: (c) 100 beats per minute Solution: Stroke volume = end-diastolic volume - end-systolic volume = 100 - 50 = 50 mL.
- A.50 beats per minute
- B.75 beats per minute
- C.100 beats per minute✓
- D.125 beats per minute
Correct Answer
(C) 100 beats per minute
Solution & Explanation
Answer: (c) 100 beats per minute Solution: Stroke volume = end-diastolic volume - end-systolic volume = 100 - 50 = 50 mL. Cardiac output = stroke volume x heart rate, so heart rate = cardiac output / stroke volume = 5000 mL / 50 mL = 100 beats per minute. NCERT: Ch 15, p.200, line 23 — "The stroke volume multiplied by the heart rate ... gives the cardiac output"
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