Answer :
Final answer:
The first event is the buffering of gastric juice, followed by the inactivation of pepsin, when pancreatic juice enters the small intestine.
Explanation:
When pancreatic juice enters the small intestine, the first event that occurs is the buffering of the acidic gastric juice in the chyme by pancreatic juice. This helps to neutralize the chyme and create an optimal environment for digestion to occur in the small intestine. The bicarbonate ions in the pancreatic juice are responsible for this buffering action.
Additionally, the pancreatic juice inactivates pepsin, which is an enzyme produced in the stomach that helps to break down proteins. Inactivation of pepsin prevents it from continuing to work in the small intestine, where different enzymes are responsible for protein digestion.
Overall, the entry of pancreatic juice into the small intestine has an important role in preparing the chyme for complete digestion and absorption of nutrients.
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