What happens to end-diastolic volume when venous return increases?

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Multiple Choice

What happens to end-diastolic volume when venous return increases?

Explanation:
Increasing venous return raises the amount of blood filling the ventricles during diastole, so end-diastolic volume goes up. That extra preload stretches the cardiac fibers more, and according to the Frank-Starling mechanism, a greater stretch leads to a stronger contraction. The heart then ejects more blood, so stroke volume increases. Therefore, the correct idea is that EDV increases and stroke volume also increases via the Frank-Starling mechanism.

Increasing venous return raises the amount of blood filling the ventricles during diastole, so end-diastolic volume goes up. That extra preload stretches the cardiac fibers more, and according to the Frank-Starling mechanism, a greater stretch leads to a stronger contraction. The heart then ejects more blood, so stroke volume increases. Therefore, the correct idea is that EDV increases and stroke volume also increases via the Frank-Starling mechanism.

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