人类与一切生物同样,全部由元素构成,目前已发现人体中有60多种元素,其中了解较清楚的有25种是机体必需元素(图1)。必需常量元素(Major elements)11种,占体重99.9%以上,主要构成机体和起电解质作用; The same is true for all human beings and all living beings. It has been found that there are more than 60 kinds of elements in the human body. Among them, 25 are known as the more essential elements of the body (Figure 1). Essential elements (Major elements) 11 species, accounting for more than 99.9% of body weight, the main body and play an electrolyte role;