Acetylcholine is an organic chemical that functions in the harn an bouk o mpny teeps o ainimals, includin humans, as a neurotransmitter—a chemical released bi nerve cells tae send signals tae ither cells. Its name is derived frae its chemical structur: it is an ester o acetic acid an choline. Pairts in the bouk that uise or are affectit bi acetylcholine are referred tae as cholinergic. Substances that interfere wi acetylcholine activity are cried anticholinergics.
