Biology - Digestion and Absorption Question with Solution | TestHub

Pepsin is a proteolytic enzyme secreted by the gastric glands in the stomach. It requires a highly acidic environment to function optimally, which is provided by the secretion of hydrochloric acid (HCl) maintaining a pH of around $1.5$ to $2.0$.

Trypsin is a proteolytic enzyme secreted by the pancreas into the duodenum. It functions optimally in an alkaline environment, which is maintained by the bicarbonate ions in the pancreatic juice and bile, keeping the pH around $7.5$ to $8.5$.

Therefore, pepsin acts in acidic pH and trypsin acts in alkaline pH.

Answer: pepsin acts in acidic pH and trypsin in alkaline pH