您曾经考虑过什么是生命的問題嗎?看来,我們全都能把生物和非生物区分开来。但是对于有机体(人、动物、植物、微生物)是由那些化学物質所構成的問題,我們不是随时都想得很清楚的。我們身体的主要化學組成部分乃是蛋白质,碳水化合物,脂肪,矿物质和水分。虽然所有这些化合物都有很大的意义,但其中最重要的是蛋白質。在生活的有机体中,蛋白質以及其他一些化合物都是由食物中的物質形成的,以后又分解成簡單的最后产物,这些产物必須排出体外。食物的消化吸收过 Have you ever considered the question of life? It seems that all of us can distinguish living from non-living things. However, we do not always think clearly about organisms (human beings, animals, plants and microorganisms) that are caused by those chemicals. The main chemical components of our body are proteins, carbohydrates, fats, minerals and water. While all of these compounds are of great interest, the most important of these are proteins. In the organism of life, proteins and other compounds are formed from the substances in the food and later broken down into simple final products that must be excreted. Digestion and absorption of food