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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.
Muscles of the human body. Photo courtesy National Library of Medicine. Muscles are one of those things that most of us take completely for granted, but they are incredibly important for two key reasons: 1  Muscles are the engine that your body uses to propel itself.ut there are three unique kinds of muscle in any mammal's body: 1  Skeletal muscle is the type of muscle that we can see and feel. 2  When a body builder works out to increase muscle mass, skeletal muscle is what is being exercised.