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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.
You need muscles in your back so that you can move your back, and the rest of your body. The muscles on your back connect to a bunch of places, like the hips, shoulders, ribs, â¦ etc. They let you twist around and basically let you function as a normal human being.