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机体在新陈代谢的过程中所产生的最终产物有的对人体无用,有的积存多了会对人体有害,都必须不断地及时地排出体外,才能维持内环境的相对恒定,从而保证机体各种机能活动的正常进行。机体把在新陈代谢过程中所产生的代谢终产物以及多余的水、盐和异物,经血液循环通过某些排泄器官排出体外的过程叫排泄。人体的排泄途径有四条:①由肺排出二氧化碳和少量水分;②由消化道排泄。排泄物主要是经肝
The body in the metabolism of the final product produced by some useless to the human body, and some more will be harmful to the human body, must be promptly excreted in order to maintain a relatively constant internal environment, so as to ensure the body’s various functions The normal activities. The process of excreting the metabolic end products and excess water, salt and foreign substances produced by metabolism in the process of metabolism through the blood circulation through certain excretory organs is called excretion. There are four ways of human body excretion: ① by the lungs to discharge carbon dioxide and a small amount of water; ② excretion by the digestive tract. Excretion is mainly via the liver