<unk> s, or<unk> s, are ionotropic receptors that form ligand gated ion channels in cells' plasma membranes. Like the other type of acetylcholine receptors, muscarinic acetylcholine receptors <unk> s), their opening is triggered by the neurotransmitter acetylcholine (ACh), but they are also opened by nicotine. Also in contrast to muscarinic ACh receptors, nicotinic receptors do not operate with a second messenger, but open themselves forming an ion channel. Their action is inhibited by curare.<unk> s are present in many tissues in the body.  The neuronal receptors are found in the central nervous system and the peripheral nervous system. The neuromuscular receptors are found in the neuromuscular junctions of somatic muscles; stimulation of these receptors causes muscular contraction.
Nicotinic acetylcholine receptor
Muscarinic acetylcholine receptor
AMPA receptor
Alpha-4 beta-2 nicotinic receptor
NMDA receptor
Opioid receptor
Vesicular monoamine transporter
5-HT receptor