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概况脂类通过血浆从一个器官转运至另一个器官,图1显示了血浆脂类转运过程的概况。通常占所吸收热卡总量的30～40%的食物脂肪是由肠粘膜以包含在乳糜微粒中的甘油三酯形式释放出来。这种甘油三酯大都在通过毛细血管的过程中水解,释放的游离脂肪酸主要掺入到脂肪细胞用于贮存。由糖合成或从血浆摄取后而蓄积在肝内的脂肪也以甘油三酯的形式分泌。甘油三酯包含在极低密度脂蛋白(VLDL)中从肝脏中释放出来,随后在肝外的毛细血管处水解,脂肪酸也大都被组织摄取而贮存。这些过程发生在进食后,此时有过量的代谢物可利用。
At a Glance Lipids are transported from one organ to another in the plasma, and Figure 1 shows an overview of the lipid lipid transport process. Food fats, which usually account for 30-40% of the total amount of heat card absorbed, are released from the intestinal mucosa as triglycerides contained in the chylomicron. Most of these triglycerides hydrolyze through the capillaries and the free fatty acids released are mainly incorporated into fat cells for storage. Fats that accumulate in the liver after sugar synthesis or plasma uptake are also secreted as triglycerides. Triglycerides are released from the liver in very low density lipoproteins (VLDL) and are subsequently hydrolyzed in the extra-hepatic capillaries. Most of the fatty acids are also taken up by the tissues and stored. These processes occur after eating, when excess metabolites are available.