ACTION OF THE ENZYMES OF PANCREATIC JUICE 



3 6i 



duodenal mucous membrane. This secretin is absorbed into the circulation 

 and acts specifically on the pancreas to produce increased activity of the pan- 

 creatic cells. Acid extracts of the duodenal mucous membrane produce the 

 same effects on the pancreas, in fact this is the current method of stimulating 

 the flow of pancreatic juice at the present time, the secretion being collected 

 from a tube introduced into the duct. 



JltiLk. 



FIG. 268. Three Curves Showing the Secretion of Pancreatic Juice upon a Diet (i) 

 of 600 c.c. of milk; (2) of 250 gm. of bread; (3) of 100 gm. of meat. The divisions along 

 the abscissae represent hours after the beginning of the meal; the figures along the ordinates 

 represent the quantity of the secretion in cubic centimeters. (Walter.) 



Under the normal stimulus of food, the flow of pancreatic juice is greatly 

 increased. The increase continues to a maximum in from two to three hours, 

 after which it gradually decreases through the period of digestion. Pawlow 

 has found a certain amount of adaptation not only of the quantity, but of 

 the enzyme composition of the pancreatic secretion to the kind and character 

 of the food (in dogs). 



Action of the Enzymes of Pancreatic Juice. The secretion of the 



