if a muscle is to perform fleion at the shoulder joint (and muscles only shorten to create an action), one what side must a flexor cross the glenohumeral joint?

Answer

anterior (front) side

Q:What is flexion? A:Flexion is a movement at a joint that decreases the angle between two bones.
Q:What is the glenohumeral joint? A:The glenohumeral joint is the joint where the humerus (upper arm bone) meets the scapula (shoulder blade).
Q:Which muscle group performs flexion of the shoulder? A:The muscle group that performs flexion of the shoulder is the anterior (front) muscles of the upper arm.
Q:On what side of the glenohumeral joint must a flexor cross in order to perform flexion? A:A flexor must cross on the anterior (front) side of the glenohumeral joint to perform flexion.