<prompt> Ion ligand receptors areGlycine receptorb adrenergic receptorsV1 receptorInsulin receptor  <response>: LikeGABA, glycine acts by increasing Cl- conductance.The ionotropic receptors of glutamate are ligand-gated ion channels that resemble nicotinic cholinergic receptors and GABA and glycine receptors. Catecholamines acting on b adrenergic receptors use cAMP mechanism. 