Lipid Digestion Lab Report

Lipid Digestion: Absorption and Transport of Lipids Lipid digestion occurs primarily in the small intestine though a small amount of lipids are broken down in the stomach. Special enzymes called lipases breakdown triglycerides the most abundant lipids in the diet and phospholipids. Lingual lipase secreted by glands in the tongue and gastric lipase secreted by gastric chief cells hydrolyze a small amount of triglycerides into fatty acids and monoglycerides. As chyme enters the duodenum from the stomach cholecytokinin stimulates the secretion of bile salts and pancreatic juice. Bile salts synthesized in the liver, and stored in the gallbladder, is released clinging to mono, di, and triglycerides of fat globules, causing the fat globules to break up into triglycerides emulsion droplets. Pancreatic juice produced by pancreatic acinar cells contains a large amount of pancreatic lipase, the principal triglyceride lipase digesting enzyme. Pancreatic lipase molecules attach to triglyceride molecules of the emulsion droplets. Each triglyceride molecule is catalyzed and broken into monoglycerides and fatty …show more content…
Triglycerols and cholesterol can be either synthesized by the liver or obtained from circulation whether that is from chylomicrons remnants or from adipocytes non-esterified fatty acid liberation. These lipids are packed and released into the blood stream by a type of lipoprotein called a VLDL (very-low density lipoproteins). VLDL is produced by the liver its purpose is to transfer fat from the liver to other tissues of the body. As fat enters the liver, the liver then utilizes the fat and releases some of it as VLDL.VLDL is high in triglycerides with a low proportion of cholesterol esters, and containd an intergral lipoprotein called apo B-100. As VLDL enters the blood stream it obtains two new apoprotiens called apo-E and apo-C which it obtains from high density lipoproteins (HDL) (Gropper & Smith,