An example of "autoreceptors" in the CNS is:: (A) NMDA receptors for, (B) Nicotinic receptors for acetyl chlorine, (C) Alpha2 receptors for NE, (D) GABA-C receptors in retina
Answer is C. Autoreceptor is a presynaptic receptor; binding of the NT with autoreceptor inhibits fuher secretion of the transmitter. a2-receptor for NE is an example of autoreceptor. NMDA receptor for glutamate is a voltage + ligand gated channel. Nicotinic AChR is a non-specific cation channel. GABA-C receptors are found exclusively in the retina; they are ionotropic receptors.