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Each time you take a step, 200 muscles work in unison to lift your foot, propel it forward, and set it down. Itamp;#39;s just one of the many thousands of tasks performed by the muscular system. This network of over 650 muscles covers the body and is the reason we can blink, smile, run, jump, and stand upright. Itamp;#39;s even responsible for the heartamp;#39;s dependable thump. First, what exactly is the muscular system? Itamp;#39;s made up of three main muscle types: skeletal muscle, which attaches via tendons to our bones, cardiac muscle, which is only found in the heart, and smooth muscle, which lines the blood vessels and certain organs, like the intestine and uterus. All three types are made up of muscle cells, also known as fibers, bundled tightly together. These bundles receive signals from the nervous system that contract the fibers, which in turn generates force and motion. This produces almost all the movements we make. Some of the only parts of the body whose motions a
