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al·pha-re·cep·tor AHD[ălʹfə-rĭ-sĕp'tər] D.J.[ˈælfərɪˌseptə]K.K.[ˈælfərɪˌsɛptɚ]n.（名词）- 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 α肾上腺素受体：自主神经系统的一个位点，当肾上腺素剂，如去正肾上腺素和肾上腺素释放时，这里会发生兴奋性反应。α肾上腺素受体的激活可引起各种生理反应，包括相关肌肉的刺激和血管的收缩 也作 alpha-adrenergic receptor
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