In the nervous system, calcium ions crossing the gap between these cause a release of acetylcholine
[DOC] [TLE] Neurotransmitters, Synapses, and Impulse Transmission - Molecular ... [PAR] Except for acetylcholine, all of these are amino acids (glycine and glutamate) or 
derived from ... Release of neurotransmitters and the recycling of synaptic 
vesicles.