NEET Biology question

Excessively high heart rate (> 180) can reduce cardiac output because

(A)Blood is moving too fast through the lungs to pick up enough oxygen
(B)It tires out the heart muscles and so they pump slower
(C)It reduces the time for ventricular filling which reduces stroke volumeCorrect
(D)The PR-interval increases which leads to longer ventricular diastole and shorter ventricular systole

Answer: (C)

Solution

At very high heart rates, the duration of diastole shortens disproportionately, leaving less time for the ventricles to fill before

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Question ID VK-116354