A Muscle Can Be a Prime Mover or an Antagonist,depending

Question

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

Accepted Answer

A muscle can act as a prime mover or an antagonist depending on the movement of the joint. For example, the biceps brachii muscle is a prime mover during elbow flexion, but it acts as an antagonist during elbow extension.