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Human bones are hard, calcified structures with caverns that hold the living bone cells. The hardness of the bone helps to protect it, but all bones are also surrounded by a living membrane called the periosteum. When a bone breaks, it is the periosteum that produces new bone cells to repair the break. The bone must be set quickly or else it will heal as it is, and there will be deformity, because the periosteum immediately receives chemical signals that the bone has been broken and begins the repair process. It is imperative that the bone be set correctly to insure that the bone heals properly.

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Q: What protects human bones and mutiplies to grow and repair broken bones?
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