Which statement BEST describes afterload?

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Multiple Choice

Which statement BEST describes afterload?

Explanation:
Afterload is the pressure the ventricle must overcome to eject blood during systole. When afterload increases, the ventricle must generate higher pressure to open the aortic valve, making it harder to push blood out. That typically reduces the amount of blood ejected with each beat, so stroke volume decreases. Hence, afterload and stroke volume move in opposite directions. The other ideas—linking afterload to heart rate or suggesting a direct increase of stroke volume with more afterload—don’t reflect how the heart works, since heart rate is governed by autonomic input and conduction, and higher afterload tends to lower, not raise, stroke volume.

Afterload is the pressure the ventricle must overcome to eject blood during systole. When afterload increases, the ventricle must generate higher pressure to open the aortic valve, making it harder to push blood out. That typically reduces the amount of blood ejected with each beat, so stroke volume decreases. Hence, afterload and stroke volume move in opposite directions. The other ideas—linking afterload to heart rate or suggesting a direct increase of stroke volume with more afterload—don’t reflect how the heart works, since heart rate is governed by autonomic input and conduction, and higher afterload tends to lower, not raise, stroke volume.

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