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Muscles enable the heart to beat, the chest to rise and fall during breathing, and blood vessels to help regulate the pressure and flow of blood through the body. When we smile and talk, muscles help us communicate, and when we exercise, they help us stay physically fit and healthy.
What Muscles Do. 1. Contract (squeeze) and thereby cause the movement of different parts of the body. For example, they move joints and bones so we can do things like raise our arm and walk. Muscles move food along our digestive system, open and close our eyes, circulate blood through our body. Different types of muscles carry out different actions. 2. Keep joints (like the hip joint) stable and in place.