It's Your Body - Facts on modern dieting helping you to a healthier life. Bones work with ligaments, tendons, and joints to provide movement of the skeleton. Bones provide an outer shell to protect our internal organs. Bones house bone marrow, the main source of blood formation.
Bones serve as a source of calcium for the entire body.
Bone formation begins in the fetus approximately 12 weeks after conception and is not gen-erally complete until adolescence although maximum density is not reached until age 30. Actually, bone formation is never complete. It is constantly being destroyed or broken down and formed anew or rebuilt throughout our lifetime. The process is normally in precise balance. There are three distinct cell types responsible for the maintenance and making of bone.