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antagonist |
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antagonist 1. any muscle that opposes the action of another 2. a drug that counteracts the effects of another drug antagonist [an′tag·ə‚nist] (biochemistry) A molecule that bears sufficient structural similarity to a second molecule to compete with that molecule for binding sites on a third molecule. (pharmacology) A drug or other chemical substance capable of reducing the physiological activity of another chemical substance; refers especially to a drug that opposes the action of a drug or other chemical substance on the nervous system by combining with and blocking the nerve receptor. (physiology) A muscle that contracts with, and limits the action of, another muscle, called an agonist, with which it is paired. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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