alpha-receptor
noun Date: 1961 any of a group of receptors that are present on cell surfaces of some effector organs and tissues innervated by the sympathetic nervous system and that mediate certain physiological responses (as vasoconstriction, relaxation of intestinal muscle, and contraction of most smooth muscle) when bound by specific adrenergic agents — compare beta-receptor

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • alpha receptor — n. a receptor, found on the surface of some cells of the sympathetic nervous system, that is stimulated by adrenergic substances resulting in constriction of blood vessels and contraction of most smooth muscle: cf. BETA RECEPTOR …   English World dictionary

  • alpha receptor — noun receptors postulated to exist on nerve cell membranes of the sympathetic nervous system in order to explain the specificity of certain agents that affect only some sympathetic activities (such as vasoconstriction and relaxation of intestinal …   Useful english dictionary

  • alpha receptor — a site on a cell that, upon interaction with epinephrine or norepinephrine, controls vasoconstriction, intestinal relaxation, pupil dilation, and other physiological processes. Also, alpha receptor. Also called alpha adrenergic receptor. Cf. beta …   Universalium

  • alpha-receptor — al·pha re·cep·tor (ălʹfə rĭ sĕp tər) 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… …   Universalium

  • alpha-receptor — al·pha re·cep·tor al fə ri .sep tər n any of a group of receptors that are present on cell surfaces of some effector organs and tissues innervated by the sympathetic nervous system and that mediate certain physiological responses (as… …   Medical dictionary

  • alpha receptor — al′pha recep tor n. biochem. phl a site on a cell that, upon interaction with epinephrine or norepinephrine, controls vasoconstriction, intestinal relaxation, pupil dilation, and other physiological processes Compare beta receptor • Etymology:… …   From formal English to slang

  • alpha-receptor — ˈ ̷ ̷  ̷ ̷  ̷ ̷ ˌ ̷ ̷  ̷ ̷ noun : any of a group of receptors that are postulated to exist on cell surfaces of some effector organs and tissues innervated by the sympathetic nervous system to explain the specificity of certain adrenergic agents… …   Useful english dictionary

  • alpha-adrenergicreceptor — alpha adrenergic receptor n. See alpha receptor. * * * …   Universalium

  • alpha-adrenergic — [al′fə ad΄rə nʉr′jik] adj. of or having to do with an alpha receptor …   English World dictionary

  • alpha-adrenergic receptor — noun receptors postulated to exist on nerve cell membranes of the sympathetic nervous system in order to explain the specificity of certain agents that affect only some sympathetic activities (such as vasoconstriction and relaxation of intestinal …   Useful english dictionary

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