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Answer for the clue "A muscle that contracts while another relaxes ", 7 letters:
agonist

Alternative clues for the word agonist

Word definitions for agonist in dictionaries

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1876, in writings on Greek drama, from Greek agonistes , literally "combatant in the games" (see agony ).

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Agonist \Ag"o*nist\, n. [Gr. ?.] One who contends for the prize in public games. [R.]

Wikipedia Word definitions in Wikipedia
An agonist is a chemical that binds to a receptor and activates the receptor to produce a biological response. Whereas an agonist causes an action, an antagonist blocks the action of the agonist and an inverse agonist causes an action opposite to that of ...

Usage examples of agonist.

Everybody is an agonist in one of Fate's time-worn games on the earth, and winning or losing is not what it seems to be in the judgement of others, but as judged by the player himself.

A receptor agonist tailored for gerontological wards, it stimulates interest in the new: combined with MDMA, it's a component of the street cocktail called sensawunda.

Lucy can’t spend the rest of her life paranoid that people are going to find out she has a brain tumor and is on some type of dopamine agonist to keep it under control.

It comes packaged with a special agent—a bradykinin agonist called 'Neurolax'—which increases the permeability of the blood-brain barrier by activating B2 receptors on the endothelial cells of the brain's capillaries.