This graph on my worksheet shows the rate of chemical reactions with the enzymes pepsin and trypsin present in certain pH conditions. It shows pepsin works in a pH level between around 1 to 5, and trypsin works in a pH level between 4 and 9. In earlier questions I stated pepsin would be the enzyme that works in the stomach (pH = 2) and trypsin would work in the small intestine (pH = 8). Sorry this is the best I can explain it! :-(

The question asks: "What must happen to the liquid as it passes from the stomach to the small intestine for digestion to occur normally?"

I have NO idea. Any help is GREATLY appreciated!!! :-)

To determine what must happen to the liquid as it passes from the stomach to the small intestine for digestion to occur normally, we need to consider the optimal pH conditions for the enzymes pepsin and trypsin.

Based on the information you provided, pepsin works best in a pH range of approximately 1 to 5, which is acidic. This suggests that the liquid in the stomach needs to remain in an acidic environment (pH around 2) to ensure pepsin can function optimally and effectively break down proteins.

On the other hand, trypsin works best in a pH range of approximately 4 to 9, which is more neutral to slightly alkaline. This indicates that the liquid needs to become less acidic as it moves from the stomach to the small intestine in order to create a more suitable pH for trypsin to carry out its role in the digestion process.

Therefore, for digestion to occur normally as the liquid passes from the stomach to the small intestine, it is essential for the liquid to undergo a process called neutralization. This occurs when bicarbonate ions are released from the pancreas into the small intestine, neutralizing the acidic liquid from the stomach, and creating a more optimal pH environment for trypsin to function properly.

Overall, the liquid needs to transition from an acidic pH in the stomach to a more neutral or slightly alkaline pH in the small intestine, achieved through the release of bicarbonate ions, to ensure efficient digestion.