<P> The 5 - HT receptors , the receptors for serotonin , are located on the cell membrane of nerve cells and other cell types in animals , and mediate the effects of serotonin as the endogenous ligand and of a broad range of pharmaceutical and hallucinogenic drugs . Except for the 5 - HT receptor , a ligand - gated ion channel , all other 5 - HT receptors are G - protein - coupled receptors ( also called seven - transmembrane , or heptahelical receptors ) that activate an intracellular second messenger cascade . </P>
where are serotonin receptors located in the body
cell membrane of nerve cells and other cell types in animals