What Is the Composition of Bone

There are 206 bones in the human body and the entire skeleton represents about 12 percent and 15 percent of young adult women's and men's body weight, respectively. That is roughly 5.5 kilograms (15 pounds) for a woman and 11 kilograms (23 pounds) for a man. Typically, when we think of bone, we think of minerals such as calcium and phosphorus, but minerals make up only 30 to 40 percent of bone weight. Beyond minerals, bone is also composed of bone cells, nerves, blood vessels, collagen, and other proteins.

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