alpha-receptor
American Heritage Dictionary:
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al·pha-re·cep·tor
(ăl'fə-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 physiological reactions, including the stimulation of associated muscles and the constriction of blood vessels. Also called alpha-adrenergic receptor.
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.
Oxford Dictionary of Sports Science & Medicine:
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alpha receptor
alpha adrenoceptor
An adrenoceptor that may be either an alpha1 receptor, which when stimulated causes vasoconstriction, or an alpha2 receptor, which inhibits the release of noradrenaline from post-ganglionic sympathetic nerve fibres.
American Heritage Stedman's Medical Dictionary:
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alpha-adrenergic receptor
n.
Any of various cell membrane receptors that can bind with norepinephrine and related substances that activate or block the actions of the cells containing such receptors; these cells initiate physiological responses such as vasoconstriction, pupil dilation, and contraction of pilomotor muscles. Also called alpha-receptor.
Saunders Veterinary Dictionary:
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alpha-adrenergic receptor
Receptors in effector organs which respond to epinephrine and norepinephrine; includes receptors in heart muscle which are responsible for increasing rate and force of cardiac contractions.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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Oxford Dictionary of Sports Science & Medicine
The Oxford Dictionary of Sports Science & Medicine. Copyright © Michael Kent 1998, 2006, 2007. All rights reserved.
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American Heritage Stedman's Medical Dictionary
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company.
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