![]() The bones contain 99% of the body’s calcium.īones have an internal structure similar to a honeycomb, which makes them rigid yet relatively light. The mineral calcium phosphate hardens this framework, giving it strength. The largest bone in the human body is the thighbone, or femur, and the smallest is the stapes in the middle ear, at around 3 millimeters long.īones consist mostly of the protein collagen, which forms a soft framework. The reason for the difference is that some people have more or fewer bones in their ribs, vertebrae, fingers, and toes. As they grow, some fuse.īy adulthood, people have between 206 and 213 bones. ![]() At birth, humans have around 270 soft bones. The skeleton accounts for around 15% of body weight. Moveover, they act as a storage area for minerals, particularly calcium. Also, it is in the bones that the body produces bone marrow and, from there, blood cells. Their functions include supporting body structure, protecting key organs, and enabling the body to move. But, bones have other key roles, including protecting vital organs, storing minerals, and providing an environment for creating bone marrow.īones are living, active tissues that the body is constantly remodeling. Bones form the scaffolding that hold the body together and allow it to move.
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