be·ta-re·cep·tor 
(bā′tə-rĭ-sĕptər, bē′-)
(bā′tə-rĭ-sĕptər, bē′-)n.
A site in the autonomic nervous system in which inhibitory responses occur when adrenergic agents, such as norepinephrine and epinephrine, are released. Activation of beta-receptors causes various physiological reactions, such as relaxation of the bronchial muscles and an increase in the rate and force of cardiac contraction. Also called beta-adrenergic receptor.
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