The pancreatic juice contains inactive enzymes trypsinogen, chymotrypsinogen, pro-carboxypeptidases, amylases, lipases and nucleases. Trypsinogen is activated by an enzyme, enterokinase, secreted by the intestinal mucosa into active trypsin, which in turn activates the other enzymes in the pancreatic juice. The bile released into the duodenum contains bile pigments (bilirubin and bili-verdin), bile salts, cholesterol and phospholipids but no enzymes. Bile helps in emulsification of fats, i.e.,breaking down of the fats into very small micelles. Bile also activates lipases. Proteins, proteoses and peptones (partially hydrolysed proteins) in the chyme reaching the intestine are acted upon by the proteolytic enzymes of pancreatic juice and converted to dipeptides. Fats are broken down by lipases with the help of bile into di-and monoglycerides.