Final answer:
The hormone secretin primarily stimulates the pancreas to release bicarbonate-rich pancreatic fluid, which neutralizes the acidic chyme in the duodenum. The correct option is a. stimulates the release of pancreatic fluid
Step-by-step explanation:
The hormone secretin has a specific role in the digestive system. When acidic chyme enters the duodenum, secretin is released, which then stimulates the pancreas to secrete bicarbonate-rich pancreatic juice. This action helps neutralize the acidic chyme and provides an optimal environment for digestive enzymes to function effectively.
Thus, among the multiple choices provided, secretin primarily stimulates the release of pancreatic fluid (option a). Secretin does not stimulate salivation, nor does it convert trypsinogen into trypsin or activate chymotrypsin directly; those processes are associated with different substances and mechanisms within the digestive system. The correct option is a. stimulates the release of pancreatic fluid