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MCAT Question A Day - 7/5/14 - Answer!

Which of the following hormonal and physiologic effects of stress would NOT be expected in a marathoner in the last mile of a marathon?

A.  Increased glucagon secretion
B.  Increased heart rate
C.  Decreased ACTH secretion
D.  Decreased blood flow to the small intestine

C is correct. Glucagon increases blood sugar, a good thing if you are running a marathon. An increased heart rate and sympathetic blood shunting might similarly be expected in someone who had just run 25 miles.