be'ta recep"tor
— Biochem., Physiol. Biochem.,Physiol.
- a site on a cell, as of the heart, that, upon interaction with epinephrine or norepinephrine, controls heartbeat and heart contractability, vasodilation, smooth muscle inhibition, and other physiological processes.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.