As explained earlier, bones have many functions other than just providing support and shape to an organism's body. Below are some functions of bones.The storing of bone marrow within the bone matrix happens in spongy bones. Erythropoiesis or formations of blood cells happen within the bone marrow, and hence it offers a sire for cell production. Spongy bones act as a shock absorber for all movements, especially at the joints while walking, jumping, etc.The spongy bones in the body are responsible for storing 99% calcium in the body and 85% phosphorus. They also regulate the mineral content in the body by releasing the necessary amount and keeping the rest. The compact bones are chiefly responsible for releasing calcium into the body. This is an important function since varying mineral levels in the body adversely affect the muscles and nervous system's functioning.