American Heritage® Dictionary of the English Language, Fourth Edition
- 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.
“I was convinced that the histamine antagonists of the day were analogous to the alpha-receptor antagonists and that the equivalent of a beta-receptor antagonist was needed to block, for example, histamine-stimulated acid secretion.”
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