Definition of alpha-receptor

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< alpha ray

alpha rhythm >

al·pha-re·cep·tor (

-r

-s

r) KEY

NOUN:

A site in the autonomic nervous system in which excitatory responses occur when adrenergic agents, such as norepinephrine and epinephrine, are released. Activation of alpha-receptors causes various physiological reactions, including the stimulation of associated muscles and the constriction of blood vessels. Also called alpha-adrenergic receptor.

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