Mineral reservoir. In addition to its mechanical functions, the bone is a reservoir for minerals. The bone stores 99% of the body's calcium and 85% of the phosphorus. It is very important to keep the blood level of calcium within a narrow range.
Red blood cells, most white blood cells, and platelets are produced in the bone marrow, the soft fatty tissue inside bone cavities. Two types of white blood cells, T and B cells, are also produced in the lymph nodes and spleen, and T cells are produced and mature in the thymus gland.
These are all part of the five functions of bones. They protect your lungs for an example.They also help you move around, without them you wouldn't be able to move. Lastly, they support you and it helps you stay in place.