http://www.nelsonthornes.com/secondary/science/scinet/scinet/body/organs/smalld.htm

Small intestine The inside of the small intestine is covered with small projections. They are like tiny fingers. Each one is called a villus. Each villus contains a network of capillaries. The digested food substances are absorbed through the wall of the small intestine in to the blood. The villi make a large surface for food to pass across. Substances in food which are not digested and absorbed pass into the large intestine.