How is strength, lightness, elasticity achieved in bones?

Bone is made up of bone tissue. They include calcium. He gives them strength and elasticity. But their shape is no less important. Our largest bones are in the form of tubes. The bone marrow is located inside. The tubular bones are very light and strong at the same time. They are located in the limbs. For example: the shoulder and forearms are tubular bones. In order for the bones to be healthy, you need to eat foods containing calcium and vitamin D. Or take special vitamins, but before that, consult your doctor.