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Choose a Page:What is the skin for?*How do muscles work?*How many bones do we have?What is inside a bone?What are veins and arteries?How does the heart work?How do our joints work? How do muscles work? There are more than 600 muscles in the body. Most of them move parts of the body or help it stay upright. Muscles cannot push, they can only pull. Many of them work in pairs, attached to bones by tendons. One muscle tightens and becomes shorter, pulling the bone after it. If it relaxes, and the other muscle tightens, the bone moves back.   Previous: Back Book: Best Ever Q&A Section: Science & Technology Chapter: Human Body