Digestion
Digestion of proteins Protein digestion begins in the stomach with the action of pepsin. ... Fat digestion and absorption is dependent upon bile. Bile secreted from the liver and released into the gut by the action of CCK on the gall bladder acts as an emulsifier to break up fat globules to facilitate digestion. ... The detergent action of bile salts, particularly lecithin is required to disperse the fat into small globules for efficient lipase digestion. ... The micelles serve the function of shuttling products of fat digestion from the site of digestion to the brush border where they can be absorbed into the enterocyte. ... Firstly it removes the products of fat digestion so that they do not inhibit the action of the lipase (product inhibition) and secondly it transports the insoluble digestion products to the cell membrane where they can diffuse directly into the cell. ... Firstly the complex of vitamin B12 and intrinsic factor is resistant to digestion.