As the skeleton reaches maturity, the number and size of osteoblasts decrease;but dormant cells remain capable of responding to injury and producing new bone as in the healing of a fracture.

• 当骨骼发育成熟时，造骨细胞的数量和大小减少，但休眠细胞依然可以对伤害做出反应，在骨折愈合过程中产生新的骨骼。