al'pha recep"tor

a site on a cell that, upon interaction with epinephrine or norepinephrine, controls vasoconstriction, intestinal relaxation, pupil dilation, and other physiological processes. Also,al'pha-re•cep"tor.Also called alpha-adrenergic receptor. Cf. beta receptor.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

alpha rayalpha rhythm
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