____ is the process by which bones are formed. Throughout this process parts of the bone are reabsorbed so that unnecessary ____ is removed via cells called ____, while new layers of bone tissue are created. The cells that bring the calcium to your bones are known as ____ and are responsible for creating bone matter. Osteoblast activity increases when you exercise so your bones will become ____ the more exercise you do. The ends of each long bone contain growing areas – or plates – which allow the bone to grow longer. These areas are called ____ plates and allow the long bones to extend. Once a bone is fully formed, the head/end of each bone fuses with the ____ shaft to create the epiphyseal line.

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