Prove that bone is a living, dynamic entity, not a bone structure.

Bones are constantly metabolized, new cells are synthesized and old cells are destroyed (for this there are special cells – osteoclasts). Bone is a depot of phosphorus and calcium, releasing them into the blood in the event of an acute deficiency in the body. Bones change in chemical composition, at a young age organic matter predominates, and in an elderly one – inorganic, therefore, the fragility of bones increases. Bones are able to regenerate in case of damage due to the cells of the inner layer of the periosteum.