How do the biceps and triceps muscles depend on each other for movement?

The biceps and triceps muscles work in opposition to each other to facilitate movement in the arm. The biceps, located at the front of the upper arm, are responsible for flexing the elbow, while the triceps, located at the back, are responsible for extending it. When the biceps contract to lift the forearm, the triceps must relax to allow this movement, and vice versa when extending the arm. This coordinated action is essential for smooth and controlled movements of the arm.