Respuesta :
Acetylcholine is released by both preganglionic and postganglionic neurons of the parasympathetic division.
The main neurotransmitter of the parasympathetic nervous system, which regulates smooth muscle contraction and blood vessel dilatation and decreases heart rate, is acetylcholine, a chemical produced by neurons. The central nervous system is filled with cholinergic neurons, which emit the excitatory neurotransmitter acetylcholine. In the membranes of the rat corpus striatum, choline promotes the release of acetylcholine and guards against the stimulation-induced drop in phosphatide levels. Acetylcholine, which is generated by the sympathetic splanchnic neurons, activates chromaffin cell membrane nicotinic acetylcholine receptors (nAChRs), which release catecholamines into the bloodstream to prepare for the fight-or-flight response.
Hence, acetylcholine is chemical messenger in nervous system.
To know more about Catecholamines.
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