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肝内各种物质代谢极为活跃,所以它在体内各类物质(如糖、脂类、蛋白质、维生素、激素等)合成与分解,转化与运输,储存与释放,分泌与排泄以及对物质代谢的调节中均起重要作用。肝脏之所以有这些功能是由于肝脏的形态结构特点和化学组成特点所决定的。肝脏的形态结构特点是:具有肝动脉和门静脉的双重血液供应。肝可以从肝动脉的体循环血液中接受由肺及其他组织运来的氧及代谢产物,又可以从门静脉的血液获取大量的消化道吸收的营养物质。肝脏也有两条输出的通路,除经由静脉与体循环相联系之外,还可以通过胆道系统与肠道使得一些肝内代谢产物和助消化作用物质相连,及有毒物质或解毒产物可以随胆汁的分泌而排入肠道.有毒物质及解毒产物则可随粪便排出体外。肝脏化学组成的特点是:肝脏内含酶种类很多,已知约在数百种以上,而且有些酶是其他组织所没有或
The metabolism of various substances in the liver is extremely active, so it synthesizes and decomposes, transforms and transports, stores and releases, secretes and excretes various kinds of substances (such as sugar, lipid, protein, vitamins and hormones) Regulation plays an important role. The reason why the liver has these features is due to the morphological characteristics of the liver and the chemical composition of the decision. The morphological features of the liver are: a dual blood supply with hepatic artery and portal vein. The liver can receive oxygen and metabolites from the circulation of blood in the hepatic artery and from the lungs and other tissues. It can also obtain a large amount of nutrients absorbed from the digestive tract of the portal vein. The liver also has two output pathways that, in addition to being connected via the veins to the systemic circulation, can also link some intrahepatic metabolites and digestive aids through the biliary system with the intestine and that toxic substances or detoxification products can be secreted with bile While excreted into the intestine.Toxic substances and detoxification products can be excreted with the feces. The chemical composition of the liver is characterized by: There are many types of enzymes in the liver, known to be in the hundreds or more, and some enzymes are not found in other tissues or