What is the role of bile in digestion of fats.

Explanation

1. Digestion of fats begin in the small intestine . The bile , pancreatic juice and intestinal juice are the secretions released into the small intestine .
2. Bile contains bile Pigments (bilirubin and biliverdin) and helps in the emulsification of fats. Bile salts reduce the surface tensions of fat droplets and break then into small globules.
3. Bile also activates lipases to digest lipids. Lipase acts on emulsified fat (triglycerides) and hydrolyses them into free fatty acid and monoglycerides.
4. Monoglycerides are further hydrolysed into fatty acid and glycerol.
5. The intestinal juice (succus entericus ) acts on the products of pancreatic digestion.
6. The intestinal juice (succus entericus) acts on the products of pancreatic digestion.
6. Diglycerides and Monoglycerides
`overset(Lipases) to` Fatty acids + Glycerol
7. Thus the macromolecule lipid is converted into Fatty acids and Glycerol.
Absorption :
1. The villi in the lumen of ileum are the absorbing units consisting of a lacteal duct in the middle surrounded by fine network of blood capillaried .
2. The insoluble substances like fatty acids , Dipeptides, glycerol are first incorporated into small spherical water soluble droplets called micelles and are absorbed into the intestinal mucosa. They are resynthesized into protein coated fat globules called chylomicrons which are transported into the lacteals within the intestinal villi and finally empty into the lymphatic duct.
3. The lymphatic ducts ultimately release the absorbed substances into the blood stream .
4. The absorbed substances are transported through lymph to the liver through the hepatic portal system. From the liver , nutrients are transported to all other regions of the body for utilization.