If venous return increases, what happens to end-diastolic volume (EDV)?

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Multiple Choice

If venous return increases, what happens to end-diastolic volume (EDV)?

Explanation:
Increasing venous return means more blood is delivered to the heart during diastole, so the ventricle fills to a higher volume. That resting stretch on the ventricular muscle at the end of filling is the end-diastolic volume. With more blood returning, EDV rises, reflecting greater preload. This extra stretch facilitates a stronger contraction (via the Frank-Starling mechanism), increasing stroke volume. So the end-diastolic volume increases when venous return goes up.

Increasing venous return means more blood is delivered to the heart during diastole, so the ventricle fills to a higher volume. That resting stretch on the ventricular muscle at the end of filling is the end-diastolic volume. With more blood returning, EDV rises, reflecting greater preload. This extra stretch facilitates a stronger contraction (via the Frank-Starling mechanism), increasing stroke volume. So the end-diastolic volume increases when venous return goes up.

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