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When you think of muscles, you might think of the ones in your legs or arms that you use to help you move. These types of muscles are called striated muscles. If you look at them under a microscope, the cells appear rectangular and striped. There are other kinds of muscles, though, called smooth muscles. The cells that make up smooth muscles are oval shaped and not striped. They are found in places like the digestive system, where they help to keep food moving.