Question

a muscle that functions to cause action is referred to as the

agonist
antagonist
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Explanation:

An agonist muscle is one that actively contracts to cause a specific movement. In contrast, an antagonist muscle opposes the action of the agonist. For example, when the biceps (agonist) contracts to flex the elbow, the triceps (antagonist) relaxes. This question is testing knowledge of muscle function terminology.

Answer:

agonist