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
Correct Answer:
Verified
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