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Acetylcholine - ACh. Peripheral N.S.Skeletal muscle contractionAutonomic NS Ganglia Parasympathetic neuroeffector junctionCentral N.S. - widespreadHippocampusHypothalamus ~. Acetylcholine - ACh . Receptor subtypes: 2 major groupsNicotinic receptors - ionotropicexcitatoryMuscarinic receptor
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