The functions of bone can basically be categorized into protective function, support function, hematopoietic function, leverage function, calcium and phosphorus reserve, and sensory function. 1. Protective function: for example, the skull has a protective function for the brain tissue; the ribs have a protective function for the heart and lungs in the chest cavity. 2. Support function: mainly the lower limbs, hip bones and spine have support function. 3. Hematopoietic function: the pelvis and cones contain a lot of bone cancellous material, which has hematopoietic function, and blood loss or extraction of hematopoietic stem cells need to be carried out in the above parts. 4. Lever function: the outside of the bone has muscles attached to it, which becomes the lever for all kinds of mechanical movements of the human body and cooperates with the muscles to complete all kinds of limb movements. 5. Storage function: Bone contains a large amount of calcium and phosphorus, which is the reserve warehouse of calcium and phosphorus. 6. Sensory function: there are abundant nerves in the periosteum of bone, so part of the bone has an important sensory role.