Action of ACh at pre- and postsynaptic nerve terminals and its removal by AChE

Acetyl CoA

Choline

Acetylcholine

N receptor

Presynaptic nerve terminal

Postsynaptic nerve terminal

CAT

CAT = choline acetyltransferase

AChE = acetylcholinesterase

N = nicotinic

M = muscarinic

N receptor

M receptor