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MCAT Question A Day - 8/14/14 - Answer!

Which of the following will most likely occur during heavy exercise?

A.  Blood pH will decrease in the active tissues.
B Less oxygen will be delivered to the tissues due to increased cardiac contractions resulting in increased blood velocity.
C.  Capillaries surrounding contracting skeletal muscles will constrict to allow increased freedom of movement.
D.  The respiratory system will deliver less nitrogen to the blood.

A is correct. Cellular respiration produces carbon dioxide, which, in turn, lowers blood pH. During heavy exercise, capillaries dilate in order to deliver more oxygen to the active tissues. Nitrogen is irrelevant to respiration.

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