1) The three sections of small intestine are the ______, the ______ and the ______. Many enzymes are brought into small intestine from the ______. Bile is also brought in through the ______ duct. ______ are finger like projections on the inner surface of the small intestine which increases the surface area. Digested nutrients are ______ through walls of the villi and then enter the ______ and the ______.
2) The key functions of digestive system are the ingestion of food, ______ of food through the digestive system, ______ by ______ and ______ digestion, ______ and ______.