Acetylcholine
= Acetylcholine
{title2=$\mathrm{ACh}$}
{wiki}
<Acetylcholine> is a <neurotransmitter> that acts through nicotinic <ionotropic receptors> and muscarinic <metabotropic receptors>. The <receptor> and the target cell's machinery determine the response; <acetylcholine> itself does not specify whether coupling is direct or mediated by intracellular <signal transduction>. <Neuroscience, 2nd edition edited by D. Purves and others/Two Families of Postsynaptic Receptors>{ref}