人体中有一些数量极微的元素,它们只占人体血液的百万分之几或千万分之几.数量虽微,却是人体组织如激素、酶类、有效蛋白质的组成成分,对人体起着重要作用.人体中微量元素不足或过多, There are some very small number of elements in the human body, they only account for a few millionths of the human blood or a few thousandths. Although the number of micro, but it is human tissue such as hormones, enzymes, effective protein composition, Plays an important role in the human body is not enough or too much trace elements,