An adult human being has 206 bones in the body. Mainly, bones consist of collagen fibers and an inorganic mineral in the form of small crystals. Living bone in the body contains between 10% and 20% of water. Of its dry mass, approximately 60-70% is bone mineral. The rest is collagen, which is the main fibrous protein in the body. The inorganic mineral calcium phosphate is found in the chemical arrangement termed calcium hydroxylapatite. This is the bone mineral that gives bones their rigidity.
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