Digestion Of Lipids

Question 1

What is the model answer for the digestion of lipids?

Answer 1

-Bile salts emulsify lipids into micelles to increase the surface area and solubility in water.
-Lipids are hydrolysed by lipase to form fatty acids and monoglycerides.
-Micelles contain fatty acids, monoglycerides and bile salts.
-Micelles move from the ileum to epithelial cells.

Question 2

What is the model answer for the absorption of lipids?

Answer 2

-Micelles contain bile salts, fatty acids and monoglycerides making them soluble in water.
-Monoglycerides and fatty acids from the micelles diffuse into the epithelial cells from the lumen by simple diffusion.
-In the endoplasmic reticulum the triglycerides are reformed.
-In the Golgi body the triglycerides combine with lipoproteins and cholesterol to form chylomicron vesicles.
-Chylomicrons move across the cell membrane by exocytosis and enter the lymph vessels called lacteals.
-Then move from the lymph to the blood.

-