Gas expands, volume increases (surface area increases) as P = F/A. Clearly force also needs to increase to keep P constant. A greater force means a greater rate of change of momentum, so the molecules must have a greater mean kinetic energy. Therefore the gas must be at a higher temperature meaning heat energy (Q) must be supplied.
When the shoulder is shrugged, this muscle is at work. When a heavy bag is carried, the levator scapulae muscle helps the body bear the burden. This muscle begins at the vertebrae just below the skull, called the cervical vertebrae. It is attached to the transverse processes of the cervical vertebrae.
The scapula separates the subscapularis muscle tendon from the scapula with a large bursa, a small sac that is filled with fluid. The bursa acts as a cushion between muscles and joints or between bones and tendons. The primary role of the subscapularis muscle is to aid in movement of the shoulder.rom there, the large subscapularis muscle attaches to the front shoulder joint. Injury of this muscle is common, particularly among athletes. The scapula is more commonly known as the shoulder blade. The scapula is the bone that connects the humerus, or arm bone, to the clavicle, also known as the collar bone.