Adrenalinlike crystalline compound occurring in the brain, intestines, and blood platelets, that induces contraction of muscles and blood vessels.A neurotransmitter involved in e.g. sleep and depression and memory; SYN. 5-hydroxytryptamine.
Or 5-hydroxytryptamine (5-HT) Chemical widely distributed in the body tissues—in the blood platelets, the wall of the intestine and the central nervous system. It is believed to be implicated in the inflammatory process and, in the nervous system, it acts as a neurotransmitter, controlling sleep.