Preganglionic sympathetic and parasympathetic fibers release…
Preganglionic sympathetic and parasympathetic fibers release ____, while the postganglionic parasympathetic fibers release ____ (for muscarinic receptors), and postganglionic sympathetic fibers release ____ (for adrenergic receptors). (Ach: Acetylcholine, NE:Norepinephrine, Epi: Epinephrine)
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