Question

give the digestive structure which emulsify and digest the fat in the chicken sandwich and describe and describe the route through which the digestion products would reach the heart.

Answer 1

Digestion of fats starts in the mouth.

1. In oral cavity lingual lipase is secreted from Ebner's glands in the tomgue.
2. Gastric lipase also help in digestion of fat.However deficiency of lingual and gastric lipase doesnot result in malabsorption of fat as pancreatic lipase is actually important for lipid digestion.
3. Principal fat digestion starts in the duodenum by pancreatic lipase,which hydrolyses 1 and 3 bonds of triglycerides that results in formation of free fatty acids and 2-monoglycerides.pancreatic lipase acts on fats that have been emulsified.
4. Fat digestion is facilitated by pancreatic co lipase
5. There is another lipase secreted from pancreas called as bile salt activated lipase,which also assist in lipid digestion.
6. The dietary cholesterol is hydrolyzed by cholesteryl ester hydrolase.
7. Fats are absorbed by passive diffusion and carrier mediated transport.As soon as fats enter the cells they are esterified,therefore a gradient is maintained for their entry into the cell.
8. Micelle are cylindrical aggregates of fats like fatty acids,monoglycerides,and cholesterol with their hydrophobic ends at the center.
9. Cholesterol is easily absorbed from the intsetine in the presence of bile,fatty acid and pancreatic juice.The absorbed cholesterol is incorporated into the chylomicrons that enter circulation via lymphatics.