Bone is a complex tissue composed of several cell types and the two major of them responsible for bone remodelling are osteoclast, which resorb bone, and osteoblast, which form new bone.

• 骨骼是具有数种细胞型态的复杂组织，而其中最重要的两种分别是负责骨吸收作用的破骨细胞及职司骨生成的造骨细胞。