Final answer:
The primary hormone from the duodenum that stimulates secretion of pancreatic enzymes is cholecystokinin (CCK). It works in conjunction with secretin to regulate the release of digestive enzymes and bicarbonate from the pancreas and bile from the gallbladder into the duodenum.
Step-by-step explanation:
The primary hormone from the duodenum that stimulates the secretion of pancreatic enzymes is cholecystokinin (CCK). The process of digestion involves various hormones that regulate the digestive secretions. When the acidic chyme enters the duodenum from the stomach, it prompts the release of two key hormones: secretin and cholecystokinin.
Secretin primarily causes the pancreas to secrete a bicarbonate-rich solution, which neutralizes the acid, while CCK is crucial for stimulating the pancreas to produce the necessary pancreatic juices that include digestive enzymes. Moreover, CCK also encourages the gallbladder to release bile into the duodenum, aiding in fat digestion. Pancreatic secretions are essential for breaking down carbohydrates, proteins, lipids, and nucleic acids present in the chyme, preparing them for absorption further along in the digestive tract.
Overall, the sophisticated coordination between secretin and CCK ensures that the duodenum's environment is optimal for nutrient absorption and the complete digestion of food. Both hormones are produced by the mucosal epithelial cells of the small intestine and reach their target organs through the bloodstream.