acetylcholine defined in 1951 yearacetylcholine - acetylcholine (Ach);
acetylcholine - Substance secreted at the ends of many nerve fibres (cholinergic fibres) when nerve impulses arrive there. Where such a nerve fibre ends at a synapse, e.g. in sympathetic and parasympathetic ganglia, ACh is the agent which stimulates the contiguous nerve cell and hence in effect 'passes the impulse on'; and similarly where the fibre connects with an effector, e.g. at the nerve-muscle junction. After secretion ACh is very rapidly destroyed by the enzyme cholinesterase, being broken down into acetate and choline. It is the acetyl ester of choline.
near acetylcholine in Knolik
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