How can norepinephrine stimulate the contraction of smooth muscle in one organ and the relaxation of smooth muscle in another organ?
A. This is not possible, as a neurotransmitter will always have the same effect no matter what organ receives it.
B. The two organs have the same adrenergic receptors for NE.
C. The two organs have different adrenergic receptors for NE.
D. The two organs have different cholinergic receptors for NE.
Answer: C
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