Absorption

Absorption - This occurs in the small intestine (especially the ileum) where Villi 9about 1mm long) increase surface area of the intestinal lining in order to make this process more efficient. It is when the products of digestion pass out of the Lumen of the gut and into the bloodstream. on the surface of the villi are microvilli (about 0.6micrometers long) which are often referred to as a brush border.