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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.
Alpha receptors and beta receptors are both located postsynaptically at the sympathetic junctions of several organs. You can find these receptors in the heart, blood vessels, airways, uterus, fatty tissues, and many other areas. There are two main types of alpha receptors: alpha 1 and alpha 2. There are three main types of beta receptors: beta 1, beta 2, and beta 3. Alpha receptors are mostly involved in the stimulation of effector cells and constriction of blood vessels.