What muscle group is responsible for flexing the elbow?

The muscle group responsible for flexing the elbow is indeed the biceps. The biceps brachii, more commonly known as the biceps, is a prominent muscle located on the front of the upper arm. When this muscle contracts, it pulls on the radius bone of the forearm, causing the elbow joint to bend, which is referred to as flexion.

This action is typically performed when lifting or curling objects towards the body. The biceps are especially active during movements that involve forearm supination (turning the palm upward) in addition to elbow flexion.

In contrast, other muscle groups mentioned are not primarily involved in elbow flexion. The triceps, located at the back of the upper arm, are responsible for extending the elbow rather than flexing it. The deltoids are shoulder muscles involved in arm abduction, flexion, and rotation, while the pectorals primarily serve functions related to moving the shoulder joint. Thus, the biceps are the key muscles in the flexing action of the elbow.