al·pha-re·cep·tor (ălfə-rĭ-sĕp′tər)
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Tweet n. 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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