已知存在于生物体内的元素有60余种,其中必需的常量元素(K、Na、Ca、Mg等11种)在体内含量较多,必需微量元素(Fe、Cu、Zn、Mn等14种)在体内含量较少。人体内的元素除构成机体外,还参与许多生化过程。 健康人体内元素含量比较恒定,但由于某些原因,如摄入量不足、生理需要量增加或某 There are more than 60 kinds of elements known to exist in the body, of which the essential elements (K, Na, Ca, Mg and so on) are more in the body and the essential trace elements (14 kinds such as Fe, Cu, Zn and Mn) ) Less in the body. In addition to the body’s elements constitute the body, but also involved in many biochemical processes. Healthy human body element content is relatively constant, but for some reasons, such as insufficient intake, increased physical requirements or a