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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.
Cells need energy to make large molecules, like hormones. Muscle cells use ATP to produce movement. As a cell makes a hormone molecule, it breaks down molecules of ATP and uses the energy to make new bonds between smaller molecules in order to produce a larger one, explain Drs. Garrett and Grisham.