Flexi Says: The small intestine is made up of three parts: the duodenum, jejunum, and ileum. Maltase, peptidase and lipase enzymes are produced by the duodenum of small intestine. The rest are produced by the pancreas and secreted into the duodenum. The pancreas is controlled by compounds called hormones. Hormones are chemical messengers in the body. They regulate many body functions including secretion of digestive enzymes. When food enters the stomach, a hormone called gastrin is secreted by the stomach. Gastrin, in turn, stimulates the pancreas to secrete its digestive enzymes. In the duodenum, bile breaks up large globules of lipids into smaller globules that are easier for lipase enzymes to break down chemically. Jejunum and ileum present in small intestine covered with villi and microvilli are responsible for the absorbtion of nutrients.