In contrast to younger patients, older patients are more prone to a decrease in blood pressure upon standing because:
A. their red blood cells are destroyed at a faster than normal rate.
B. the aging process results in an overall increase in blood volume.
C. the baroreceptors have become less sensitive to blood pressure.
D. any change in position causes blood to be shunted to the brain.
Answer: C. the baroreceptors have become less sensitive to blood pressure.
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