ACE Personal Trainer Practice Exam

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What type of joint is the Glenohumeral Joint?

Hinge joint
Ball and socket joint
Pivot joint
Condyloid joint

The correct answer is: Ball and socket joint

The Glenohumeral Joint is classified as a ball and socket joint, which is characterized by a rounded end of one bone fitting into a cup-like receptacle of another bone. This structure allows for a wide range of motion, making it highly mobile. In the case of the Glenohumeral Joint, the head of the humerus fits into the shallow glenoid cavity of the scapula, enabling movements such as flexion, extension, abduction, adduction, and rotation. The design of the ball and socket joint facilitates not only the extensive mobility necessary for various activities but also places certain demands on the stability mechanisms within the joint, such as the rotator cuff muscles and the joint capsule. This combination of mobility and the ability to perform complex movements is essential for the functionality of the upper limb.