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• 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)

• alpha receptor
• alpha-adrenoceptor

News & Articles

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• Painful, Days-Long Erections Also Happen in Women
  The condition, in which the erect penis or engorged clitoris does not return to its normal state, is called priapism, and is much more common in men than in women. These drugs block a type of receptor called alpha-adrenergic receptors.
  Feb. 24, 2014 - LiveScience.com via Yahoo! News