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A fully developed bone is made up of mineral salts, water and tissue. There are two types of bone - compact and cancellate. A compact bone is smooth and solid, while a cancellate bone is a much lighter structure. The structure of the cancellate bone is similar to a honeycomb. All bones are a combination of cancellate and compact bone.
Inside each bone is a jelly like substance. This is called bone marrow and is at the center of the bone. This marrow produces blood cells for the body. Blood vessels run through the center of the bone so that the bone receives food, oxygen and minerals.
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