Smooth muscle relaxation and vessel dilation are caused mainly by which of the following? 1. Action of local metabolites 2. Cholinergic stimulation 3. Stimulation of beta-adrenergic receptors
a. 1 and 3 only
b. 2 and 3 only
c. 1 and 2 only
d. 1, 2, and 3
ANS: B
Smooth muscle relaxation and vessel dilation occur as a result of stimulation of cholinergic or specialized beta-adrenergic receptors.
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