How is the human muscle and bone system for raising the lower arm?

The human muscle and bone system raises the lower arm primarily through the coordinated action of muscles and joints. The biceps brachii muscle, located on the front of the upper arm, contracts to flex the elbow joint, lifting the forearm upward. The humerus, the bone of the upper arm, acts as a lever, while the elbow joint serves as the pivot point, allowing for efficient movement. Additionally, the triceps muscle on the back of the arm provides stability and balance during this motion.