5-hydroxytryptamine

Definition of 5-hydroxytryptamine
National Cancer Institute

5-hydroxytryptamine

(5-hy-DROK-see-TRIP-tuh-meen)
A substance that is found mostly in the digestive tract, central nervous system (brain and spinal cord), and platelets. 5-hydroxytryptamine acts both as a neurotransmitter (a substance that nerves use to send messages to one another) and a vasoconstrictor (a substance that causes blood vessels to narrow). A low level of 5-hydroxytryptamine in the brain is thought to be a cause of depression. Also called serotonin.

Source: NCI Dictionary of Cancer Terms