Which muscles act as antagonists to the biceps, providing the opposite motion of the lower arm?

The triceps are the antagonists to the biceps because they perform the opposite action when it comes to the movement of the lower arm. When the biceps contract to flex the elbow, the triceps must relax to allow that motion. Conversely, when the triceps contract, they extend the elbow, creating a straightening movement of the arm, which is the opposite of what the biceps do.

This antagonistic relationship is fundamental to how muscles work in pairs to create movement. The coordinated activity of these muscle groups allows for smooth and controlled motions of the arm. Understanding this relationship highlights the importance of balance between opposing muscle groups in functional movement and injury prevention.