A muscle can be a prime mover or an antagonist, depending on the movement of the joint.

Name: A muscle can be a prime mover or an antagonist, depending on the movement of the joint.
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Question

Quizplus · Accepted Answer

This is true. A muscle can act as a prime mover (or agonist) for a certain movement, while acting as an antagonist to another movement of the joint. For example, the biceps brachii acts as a prime mover for elbow flexion and as an antagonist for elbow extension.

A Muscle Can Be a Prime Mover or an Antagonist