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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? What is inside a bone? Bones are not solid. They have a strong outer layer of compact bone, with lightweight, spongy bone inside. In the centre is the soft marrow, which makes new red cells for the blood.   Previous: Back Book: Best Ever Q&A Section: Science & Technology Chapter: Human Body