 Dear students, in this topic we shall discuss the absorption of food in the intestine. The breakdown products of digestion include the amino acids, glucose, fatty acids and glass roll. These products of digestion are absorbed from the gut into the bloodstream and are transported to animals, tissues and cells by the blood. Most of the absorption occurs through the helium of small intestine. This helium has specific specialized structures which are villi, which are specialized for absorptive functions. Each villus is supplied with blood capillaries and a lactial and is covered with absorptive epithelial cells. These epithelial cells have microvilli in their apical membrane. These features make villi the best absorptive structures in the helium. The microvilli, which are present on the apical surface of epithelial cells, have specialized features for absorption of all types of digested food products. For example, they have a glycocalyx, they have digestive enzymes associated with their membrane and they have specific intramembrane transporter proteins. The simple sugars and amino acids are taken up by these microvilli of the epithelial cells. This absorption occurs by diffusion or active transport. From the microvilli, they diffuse into the blood capillaries of villi. The absorption of fatty acids and glycerol takes a different root. They form micellies when the fat and lipids are digested, they are broken down into fatty acids and glycerol, but bile salts aggregate around these products of digestion, that is around the fatty acids and glycerol, forming micellies. Micellies pass by simple diffusion into the epithelial cells. In the epithelial cells, fatty acids and glycerol recombine and form triacylglycerols. Proteins combine with these triacylglycerols to form chylomicrons. These chylomicrons are in this way lipoproteins. Now chylomicrons enter the lacteals of villi, because lipoproteins are larger molecules and larger molecules cannot be transported through capillaries of the blood. Chylomicrons enter the lacteals of villi, so the transport of digested fats that are not digested is recombined, that transport occurs by the lymphatic system. These fats are products of digestion of fat are handed over to the blood via thoracic lymphatic duct. The thoracic lymphatic duct pours all of its lymph into the blood. In the blood, plasma enzymes are present, which hydrolyze these lipoproteins again into fatty acids which are delivered to the body tissues and cells.