Final answer:
The glenohumeral joint is the most mobile upper extremity joint due to its ball-and-socket structure, allowing for the largest range of motion.
Explanation:
The glenohumeral joint is the most mobile of the upper extremity joints. It is a ball-and-socket joint formed by the articulation between the head of the humerus and the glenoid cavity of the scapula. This joint offers the largest range of motion in the body.
Learn more about Shoulder Joint here:
https://brainly.com/question/41462464
