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, commonly referred to as the shoulder blade, is the bone that attaches to the back of your rib cage. It is the bone that creates the shoulder joint with the upper arm, called the humerus bone. The scapulae can move in six actions and each action has primary muscles that create that action.