Final answer:
The most vulnerable joint in the human body is the glenohumeral joint, due to its wide range of motion and the complexity of its structure, which makes it less stable compared to others (A).
Step-by-step explanation:
The most vulnerable joint in the human body is the glenohumeral joint, which is commonly known as the shoulder joint. When comparing the options provided:
- a. Glenohumeral joint: This is a ball-and-socket joint that allows for a wide range of motion in multiple directions, making it less stable and therefore more prone to dislocation and injury than more constrained joints.
- b. Costoclavicular joint: This term may be a confusion with the costoclavicular ligament, which stabilizes the clavicle at the sternum.
- c. Acromioclavicular joint: This joint is where the clavicle meets the acromion of the scapula. It can be injured but is not considered as vulnerable as the glenohumeral joint.
- d. Sternoclavicular joint: This joint connects the sternum to the clavicle and is relatively protected and stable compared to the glenohumeral joint.
Therefore, the correct answer is a. Glenohumeral joint.