Which of the following best explains the drop in blood pressure that occurs when one goes from lying down to standing up?
A. An increase in afterload causes a drop in stroke volume, cardiac output, and blood pressure.
B. Venous compliance allows blood to pool in the legs, decreasing venous return. This causes a drop in cardiac output and blood pressure.
C. An increase in preload causes a drop in stroke volume, cardiac output, and blood pressure.
D. The heart rate decreases. This is due to the baroreceptor reflex reducing sympathetic output to the SA node.
Answer: B
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