What will be the number of heartbeats per minute, if the stroke volume of heart increases with the total volume of blood remains same?

Remains constant

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Decreases

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Increases

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Becomes erratic

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Solution

The correct option is B Decreases
Cardiac output is the volume of the blood pumped out by each ventricle per minute. (Stroke volume * Heart beats = Cardiac output). Since the volume remains constant (according to the question) and stroke volume increases, the number of heart beats should decrease to satisfy the above formula.

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