from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See alpha-receptor.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. 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 muscles and contraction of smooth muscles)
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