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The classical site of muscarinic receptors is at the postganglionic parasympathetic neuroeffector junction in smooth muscle, heart, and exocrine glands. However, muscarinic receptors also exist on effectors cells, even in the absence of cholinergic innervation.Prototype agonists include muscarine and ACh.he classical site of muscarinic receptors is at the postganglionic parasympathetic neuroeffector junction in smooth muscle, heart, and exocrine glands. However, muscarinic receptors also exist on effectors cells, even in the absence of cholinergic innervation. Prototype agonists include muscarine and ACh.
Definition of muscarinic. : of, relating to, resembling, producing, or mediating the parasympathetic effects (such as a slowed heart rate and increased activity of smooth muscle) produced by muscarine muscarinic receptors â compare nicotinic.