biogenic amine, one of a large group of naturally occurring biologically active compounds, most of which act as neurotransmitters. The most dominant, norepinephrine, is involved in such physiological functions as emotional reactions, memory, sleep, and arousal from sleep. Other biochemicals of the group include three catecholamines: histamine, serotonin, and dopamine. These substances are active in regulating blood pressure, elimination, body temperature, and many other centrally mediated body functions.
