ACTION OF THE ENZYMES OF PANCREATIC JUICE 



335 



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 



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 



J)1Ulk. 



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 too gm. of meat. The divisions along the abscissa repre- 

 sent hours after the beginning of the meal; the figures along theordinates represent the quantity 

 of the secretion in cubic centimeters. (Walter.) 



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 

 pancreas accomplishes its digestive action by means of the enzymes given 

 above, viz., trypsin, amylopsin, steapsin, and maltase. 



Trypsin. Trypsin is a proteolytic enzyme. Strange to say it does not exist 

 in the fresh pancreatic juice as such, but makes its appearance only when there 



