The bicep brachii muscle is a type of two-headed muscle which runs from the shoulder all the way to the elbow. This type of muscles is used by humans for a number of different types of movements and activities. Among these movements are the supination of the proximal radius joint, the flexion of the humerus joint, and the ability to move the glenohumeral joint.
The human bicep consists of two different bundles of muscles with differing origin points, and it is capable of much more than simply moving objects toward and away from the chest. It can interact with other joints and muscles in the human body in order to contribute to more complex and nuanced motions. Because it has both a short and long bundle of muscle, the bicep is able to perform these movements effectively.
Biceps are useful for helping move and turn the forearms. By using their biceps, people are able to twist and turn their forearms. Humans could not turn keys in locks or start cars if they were unable to supinate their proximal radius joint. The bicep is also responsible for flexing the elbow, allowing the muscle to be curled. Additionally, the bicep aids in moving the shoulder. Although its functions relating to the shoulder are somewhat weak, it can still help bring the arm forward and upward and can even help stabilize the shoulder itself.