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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.
Acetylcholine receptors are located on the motor end plate or  postsynaptic sarcolemma. Otto Loewi was a German pharmacologist  whose discovery of acetylcholine earned the 1 â¦ 936 Nobel prize in  Physiology or Medicine which he shared with Sir Henry Dale.n the mammalian ear the sensory receptors (hair cells) for hearing are in the cochlea and for ballance are in the semicircular canals.