<prompt> Which of the following is an ionotropic receptor?Muscarinic cholinergic receptorNicotinic cholinergic receptorGlucocoicoid receptorInsulin receptor  <response>: Nicotinic cholinergic receptor- Ionotropic receptor Muscarinic cholinergic receptor- G-protein coupled receptor Glucocoicoid receptor- Intracellular receptor Insulin receptor- Enzymatic receptor 