Bones is never metabolically at rest; it constantly remodels and reappropriates its matrix and minerals along lines of mechanical stress.

• 没有骨骼系统，我们不会完成诸如行走或抓握的动作。没有骨骼系统的保护，轻微的撞击，就会损伤头部或心脏。没有骨骼，人甚至不能咀嚼食物。