90 HUMAN PHYSIOLOGY CHAP. 



into the intestines through its duct. The pancreatic 

 juice is the most important digestive fluid, for it contains 

 substances which act upon starches and proteids, and 

 besides it has a substance that can act upon fats and 

 oils, changing them into an emulsion, or into soap. The 

 pancreatic juice does all that the other juices do and 

 does it better and more quickly. The pancreatic and 

 intestinal juices complete the process of digestion, doing 

 what was poorly done or left undone by the other di- 

 gestive fluids. 



Gal I sac 



A 



Bile duct 

 Artery 

 eft lobe 



FIG. 52. Under surface of the liver. -Modified from Heitzmann. (Becker.) 



The liver, located on the right side just over the 

 stomach, is the largest gland of the body. It is dark 

 brown in color and weighs between three and four 

 pounds. This large gland is very important, for it does 

 many useful things. One of the functions of the liver 

 is to manufacture a fluid called bile. The bile is poured 

 into the intestines through the bile-duct, which unites 

 with the duct from the pancreas, and together they 



