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Noun
1. antagonist (muscle)Anatomy
Wikipedia definition
2. Antagonist (muscle)Most muscles work in pairs, and when a muscle works it needs to have an agonist and an antagonist, unless the muscle's natural state is opposite to that which is produced by the muscle, example Sphincter ani externus muscle. Antagonistic pairs are located in opposite sides of a joint or bone. An "antagonist" is a classification used to describe a muscle that acts in opposition to the specific movement generated by the agonist and is responsible for returning a limb to its initial position.
Read “Antagonist (muscle)” on English Wikipedia
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Read “Antagonist (muscle)” on DBpedia

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