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agonist


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n. 1. (prime mover) a muscle whose active contraction causes movement of a part of the body. Contraction of an agonist is associated with relaxation of its antagonist. 2. a drug or other substance that acts at a cell-receptor site to produce an effect that is the same as, or similar to, that of the body’s normal chemical messenger. Sympathomimetic drugs (alpha agonists and beta agonists) are examples.

1. (prime mover) a muscle whose active contraction causes movement of a part of the body. Contraction of an agonist is associated with relaxation of its antagonist. 2. a drug or other substance that acts at a cell-receptor site to produce an effect that is the same as, or similar to, that of the body’s normal chemical messenger. Sympathomimetic drugs (alpha agonists and beta agonists) are examples.


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