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alpha-receptor

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alpha receptor

–noun
a site on a cell that, upon interaction with epinephrine or norepinephrine, controls vasoconstriction, intestinal relaxation, pupil dilation, and other physiological processes.
Also, al⋅pha-re⋅cep⋅tor.
Compare beta receptor.


Origin:
1960–65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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al·pha-re·cep·tor   (āl'fə-rĭ-sěp'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.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: al·pha–re·cep·tor
Pronunciation: 'al-f&-ri-"sep-t&r
Function: noun
: any of a group of receptors that arepostulated 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 in activating or blockingonly some sympathetic activities (as vasoconstriction, relaxation of intestinal muscle, and contraction of most smooth muscle) —compare BETA-RECEPTOR
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

alpha-receptor n.
See alpha-adrenergic receptor.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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