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An increase in venous return will _______.Question 12Select one:A.increase the contractility of the heartB.increase EDVC.increase stroke volumeD.increase EDV, increase stroke volume and increase the contractility of the heart

Question

An increase in venous return will _______.Question 12Select one:A.increase the contractility of the heartB.increase EDVC.increase stroke volumeD.increase EDV, increase stroke volume and increase the contractility of the heart

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Solution

The answer is D. An increase in venous return will increase EDV (End Diastolic Volume), increase stroke volume, and increase the contractility of the heart.

Here's why:

  1. Venous return is the amount of blood returned to the heart by the veins. When venous return increases, it means more blood is filling the heart during diastole. This increases the End Diastolic Volume (EDV), which is the volume of blood in the ventricles at the end of diastole.

  2. The increase in EDV stretches the ventricles, leading to a more forceful contraction due to the Frank-Starling mechanism of the heart. This increases the stroke volume, which is the amount of blood pumped out of the heart in one beat.

  3. The increased stretch (due to increased EDV) also increases the contractility of the heart, which is the inherent capacity of the heart muscle to contract independently of changes in the preload or afterload. Increased contractility means the heart can pump out more blood per beat.

So, an increase in venous return leads to an increase in EDV, stroke volume, and contractility of the heart.

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