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.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.