<P> There, the villi and the microvilli increase intestinal absorptive surface area approximately 30-fold and 600-fold, respectively, providing exceptionally efficient absorption of nutrients in the lumen . </P> <P> There are also enzymes (enterocyte digestive enzyme) on the surface for digestion . Villus capillaries collect amino acids and simple sugars taken up by the villi into the blood stream . Villus lacteals (lymph capillary) collect absorbed chylomicrons, which are lipoproteins composed of triglycerides, cholesterol and amphipathic proteins, and are taken to the rest of the body through the lymph fluid . </P> <P> Villi are specialised for absorption in the small intestine as they have a thin wall, one cell thick, which enables a shorter diffusion path . They have a large surface area so there will be more efficient absorption of fatty acids and glycerol into the blood stream . They have a rich blood supply to keep a concentration gradient . </P> <Ul> <Li> <P> Different stages of coeliac disease </P> </Li> <Li> <P> Structure of a villus </P> </Li> <Li> <P> Microvilli (shaggy hair) show electron dense plaques (open arrow) at their apices . </P> </Li> </Ul>

Where are most villi found in the digestive system