which produces red blood cells as well as special white blood cells and red marrow produces of the elements of blood (Levine and Miller, 1998).
             When you are born you do have blood but one thing you don't have is bones. You actually do have bones when you are born they are just not like an adult's bones. A baby's bones are composed of cartilage, but when a baby goes though ossification which is the process of bone formation, the bone that they need to support their body forms. During this process bone cells replace cartilage cells and calcium is deposited between the bone cells. Bone formation occurs throughout life, but most of it takes place within the first 25 years of your life. The diagram below shows how the process of bone formation occurs.
             The growth of a bone occurs at the epiphyses, or epiphyseal plates. Epiphysis is a cartilage disc which can be found near the end of a long bone. Most epiphyses close around age 18 although some may be there until about age 25. Circumferential growth is a growth of lo
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