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某些元素对机体功能的作用越来越受到重视,已知浓度很低的铁和锌是人体代谢所必需,而铅与镉在同样浓度下却对人体有害。还有一些元素如硒,在相当小的浓度范围内对人体可能有利,如适量的硒可能有防癌作用,缺硒或过多的硒可能致癌。大量调查分析证明,硒缺乏很可能是克山病发病因素之一。细胞内有些酶的活动必须有高浓度钾的存在,如糖酵解中的丙酮酸激酶等;而组织创伤的修复则需要锌的参与。适量元素是机体正常功能所必需,但各种元素过多或过少都可导致机体生理功能的紊乱或发生某些疾病。至于元素对细胞生理功能的作用,不仅与各种元素的量,而且与元素之间的相互作用以及比例等也都有重要关系。
The role of some elements of the body functions more and more attention, it is known that very low concentrations of iron and zinc are necessary for human metabolism, and lead and cadmium at the same concentration is harmful to humans. There are some elements such as selenium, in a very small range of concentrations may benefit the human body, such as the amount of selenium may have anti-cancer effects, selenium or too much selenium may cause cancer. A large number of investigation and analysis shows that the lack of selenium is likely to be one of the causes of Keshan disease. Some intracellular enzyme activity must have a high concentration of potassium, such as glycolytic pyruvate kinase; and repair of tissue trauma requires the participation of zinc. The right amount of elements is necessary for the normal function of the body, but too much or too little variety of elements can lead to physiological disorders or the occurrence of certain diseases. As for the role of elements on the physiological function of cells, not only with the amount of various elements, but also with the elements of the interaction between the ratio also have an important relationship.