人体同其他物质一样,都是由化学元素组成的。这些元素一方面做为“建筑材料”构成人体组织,另一方面,维持人体正常的生理功能。由于是进化的产物,在漫长的过程中,不断地与环境进行物质交换。因此,人体几乎含有自然界存在的所有元素,而且在种类和数量上与地球表面的组成基本一致,其中,除 Like other substances, the human body is composed of chemical elements. On the one hand, these elements constitute human tissues as “building materials ” and, on the other hand, maintain the normal physiological functions of the human body. Due to the product of evolution, in the long process of continuous material exchange with the environment. Therefore, the human body contains almost all the elements that exist in nature, and in the nature and quantity of the composition of the Earth’s surface is basically the same, in addition to