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Practice MCAT Question - Q116 - Answer!

Starling’s Law states that as the volume of the blood entering the heart increases, the cardiac muscle cells in the ventricles will stretch and respond with a stronger contraction. What aspect of cardiovascular physiology will be affected?

A.  Stroke volume
B.  Cardiac output
C.  Blood pressure
D.  All of the above

The correct answer is (D). When the ventricular muscle cells are stretched, they respond with a stronger contraction, and more blood can be pumped with each beat (stroke volume). Anything that increases stroke volume also increases cardiac output (heart rate x stroke volume). Anything that increases cardiac output also increases blood pressure.

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