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Function of Bile in Fat Digestion and Absorption - Essay Example

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From the essay "Function of Bile in Fat Digestion and Absorption," it is clear that almost 90 percent of used bile salts are recycled via enterohepatic circulation. The cycle is repeated about fifteen times before the bile salts are discarded in the feces…
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Function of Bile in Fat Digestion and Absorption
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"Function of Bile in Fat Digestion and Absorption"

Download file to see previous pages The nature of bile acids enables them to emulsify lipid aggregates in a detergent like action. The fats, which are hydrophobic, tend to join together with other fat droplets to form large molecules. However, the bile hinders this from happening. In the ileum, the hydrophobic section of the bile is absorbed in the fat droplet leaving a tail like hydrophilic end which repels other fat molecules. The emulsification increases the surface area of the fats hence increasing the rate of digestion by enzymatic lipases. The bile acids further solubilize the lipids by forming micelles and aid in their transport through aqueous environments. The micelles are acted up on by lipases and broken down into fatty acids and mono glycerides. These broken down units are small enough to penetrate through the walls of the small intestine through the process of absorption. They then enter the epithelial cells of the intestinal walls where the mono glycerides and fatty acids are converted into triglycerides with a protein coating. The newly formed water soluble chylomicrons enter into the lymphatic system and are transported through the bloodstream to various organs of the body for usage. In conclusion, almost 90 percent of used bile salts are recycled via enterohepatic circulation. The cycle is repeated about fifteen times before the bile salts are discarded in the feces. Nevertheless, there is constant secretion of bile salts in small amounts by the liver to replace those salts that are not recycled. ...Download file to see next pagesRead More
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