Question

What is the primary muscle involved in chest PC?

1) Pectoralis Major
2) Pectoralis Minor
3) Deltoid
4) Latissimus Dorsi

Answer 1

The primary muscle involved in chest pectoral girdle movements is the pectoralis major, which is responsible for moving the arm at the shoulder joint.

Step-by-step explanation:

The primary muscle involved in chest pectoral girdle (PC) movements, particularly those moving the humerus, is the pectoralis major. This muscle is an axial muscle that is thick and fan-shaped, and it covers much of the superior portion of the anterior thorax. The pectoralis major is instrumental in performing movements such as pushing and lifting. In contrast, the pectoralis minor helps move the scapula and assists in inhalation, but it is not the primary muscle responsible for moving the arm at the shoulder joint. Hence, the correct answer from the options provided would be 1) Pectoralis Major.