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何谓排泄?人和动物的物质代谢不断产生一些终产物,如尿素、尿酸、肌酸、肌酐、胆色素、SO_4~(2-)、CO_2、NH_(?)和多余水与各种电解质以及外部进入体内的毒物,这些物质在血液中积累过多,不仅破坏机体内环境的稳定,而且还会造成各种中毒症状影响消化吸收和中间代谢,甚至危及生命.而排泄就是通过某些器官将血液中上述物质排出体外的生理过程.换言之,人和动物把新陈代谢的最终产物以及其他身体不需要或对身体有害的物质向体外输送的生理过程称为排泄. 因排泄物的组成不同,所以机体的排泄途径是
What is excretion? The metabolism of matter in humans and animals continually produces end products such as urea, uric acid, creatine, creatinine, bilidin, SO 4 2-, CO 2, NH 2, and excess water with various electrolytes and external Into the body of toxic substances, these substances accumulate in the blood too much, not only undermine the stability of the body environment, but also cause a variety of symptoms of poisoning affect digestion and absorption and metabolism, and even life-threatening .And excretion is through certain organs of the blood In other words, the human and animal metabolism of the final product, as well as other body does not need or harmful substances to the physical process of excretion is excreted because of the composition of the excrement, so the body’s The excretion route is