The two main adrenergic receptors are alpha and beta. Whereas alpha-adrenergic receptors respond to adrenaline, be-ta-adrenergic receptors respond to:
A. nicotine
B. sympathomimetics
C. acetylcholine
D. norepinephrine or epinephrine
d
Rationale: Beta-adrenergic receptors respond to norepinephrine or epinephrine and are found on smooth and cardiac muscle membranes.
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