构成人体的化学物质种类很多,从它们所占的质量比例来分析,人体主要由蛋白质、脂类、糖类等有机物和水分构成。此外还有种类繁多的无机物即矿物质也是人体的组成部分。在人体内已知的矿物质有60余种,这些矿物质的总重却只有占人体重量的4—5％。其中数量较多的有钙、镁、钾、钠、磷、硫、氯七种,它们占了矿物质重量的60—70％,其余50多种矿物 There are many kinds of chemical substances that make up the human body. From the proportion of their mass, human body mainly consists of organic matter such as protein, lipid, carbohydrate and water. In addition there is a wide variety of minerals that are also part of the body. More than 60 minerals are known in the human body, but the total weight of these minerals accounts for only 4-5% of the human body weight. Among them, there are seven kinds of calcium, magnesium, potassium, sodium, phosphorus, sulfur and chlorine in large quantities, accounting for 60-70% of the weight of minerals. The remaining 50 kinds of minerals