(1) A hormone that prevents the secretion of gastric juice
(2) An enzyme that activates the enzyme of pancreatic juice
(3) An enzyme that activates the proteolytic enzymes of succus entericus
(4) Hormone that prevents the secretion of pancreatic juice
(2) 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 (page-262).