Besides moving the body parts around joints, skeletal muscles also perform other purposes in the human body.
Some muscles are specially designed to maintain the erect posture of the human body.
Breathing is the process by which air is moved into and out of the lungs. The skeletal muscles of the rib cage and the abdominal cavity produce the various muscular actions of breathing.
The interior pressures of the trunk must be increased by the muscles of the trunk wall for two purposes:
Evacuation of substances from the body.
Stabilization so that the trunk can act as a base for work of the upper members.
Skeletal muscles can also produce a more or less continuous contraction to immobilize an area of the body. This occurs around painful areas, such as inflamed joints or fractures. This muscular response is called splinting.