Which of the following statements about the response of arteriolar smooth muscle to changing oxygen partial pressures is TRUE?
A. Systemic arterioles respond to a decrease in PO2 by constricting, but pulmonary arterioles dilate in response to decreased PO2.
B. Both systemic and pulmonary arterioles respond to a decrease in PO2 by dilating.
C. Both systemic and pulmonary arterioles respond to a decrease in PO2 by constricting.
D. Changes in PO2 do not affect arteriolar smooth muscle in the pulmonary system.
E. Systemic arterioles respond to a decrease in PO2 by dilating, but pulmonary arterioles constrict in response to decreased PO2.
Answer: E
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