Which muscle is responsible for lifting the forearm and flexing the elbow?

The muscle responsible for lifting the forearm and flexing the elbow is the bicep. The bicep brachii, commonly referred to as the bicep, is located in the upper arm and consists of two heads. When it contracts, it pulls the forearm up towards the shoulder, resulting in the flexion of the elbow. This action is crucial for various daily activities, such as lifting objects and performing movements that require bending of the arm.

In contrast, the triceps are located at the back of the upper arm and are primarily responsible for the extension of the elbow, which is the opposite action. The deltoid muscle is located on the shoulder and is primarily involved in arm abduction and shoulder movements rather than elbow flexion. The forearm flexor group refers to muscles in the forearm that aid in flexing the wrist and fingers but does not play a significant role in flexing the elbow joint itself.