1.Movement. All skeletal muscles are attached to bones so when a muscle contracts, your bones move, too (Figure 5.1). This allows you to walk, run, and work with your hands.
2.Posture. The tone of your skeletal muscles holds you straight when sitting, standing, or moving.
3.Body heat. When skeletal muscles contract, they produce the heat needed to maintain your body temperature.
4.Respiration. Skeletal muscles move the chest wall as you breathe.
5.Communication. Skeletal muscles enable you to speak, write, type, gesture, and smile.