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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.
Types of Muscles. 1  Skeletal Muscles-These are the muscles we use to move around. 2  They cover our skeleton and move our bones. 3  Sometimes they are called striped muscles because they come in long dark and light bands of fibers and look striped. These muscles work without us having to think about them. 2  Cardiac Muscle-This is a special muscle that pumps our heart and blood through our body. 3  Shivering is caused by hundreds of muscles expanding and contracting to produce heat and make us warmer.