一、体液是细胞的主要组成成分,也是细胞的内环境,保持内环境平衡很重要。在临床上小儿脱水是一种常见的症状,比成人要多几倍,其原因是:1.体液的成分和分布不同。年龄越小体液总量越多,如成人液体占体重的60%,而婴儿占70%～80%。2.小儿代谢水平较高,需水量大。如成人每日每公斤体重需水35毫升,婴儿每日每公斤体重需水 First, the body fluid is the main component of cells, but also the cell’s internal environment, to maintain the balance of the internal environment is very important. In clinical pediatric dehydration is a common symptom, several times more than adults, the reason is: 1. The composition and distribution of body fluids are different. The younger the total amount of body fluids, such as adult liquid accounts for 60% of body weight, and infants accounted for 70% to 80%. 2. Pediatric metabolism is high, water demand. Such as adult daily water body weight per kilogram of 35 ml, baby water body weight per kilogram per day