For centuries, the bones are considered as a dead structure that only serves to support the soft tissue surrounding active. The souls gradually realize that the bone alive and growing. Bone has its own blood vessels and is always built and reshaped.
Framework not only serves as a buffer body. The joints between bones that allows flexible bones move when the muscle pull. Framework also protects vital organs. For example, the skull protects the brain. Own bone calcium stores play a role, which is essential for the continuation of mineral working muscles and nerves. Bones also produce various types of blood cells. The framework contains cartilage (cartilage) that covers the ends of bones in the joints and become part of the system framework of the ears and nose. There is also cartilage between the sternum and ribs.
According to the shape and size, the bones can be divided into four main groups. Pipe bone, short bone, flat bone, and spine.
Axial framework includes the skull, spine, ribs, and sternum. The skull contains the brain and sensory organs such as the principal eyes, ears, tongue and nose.
Framework of the appendix consists of hand and foot bones, and bones tie that united them with other body parts. Hands and feet contain many tiny bones. With nimble hands can play and move the object. Legs help balance the body.