Question:
Pepsin and Trypsin are protein digesting enzymes. Their optimum pH values are 2 and 9.5 respectively. What is the location of these enzymes in the digestive tract?
Pepsin and Trypsin are protein digesting enzymes. Their optimum pH values are 2 and 9.5 respectively. What is the location of these enzymes in the digestive tract?
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Pepsin works in acidic gastric juice, while trypsin works in the alkaline medium of the small intestine.
Updated On: Nov 12, 2026
- Pepsin: Duodenum: Trypsin: Stomach.
- Pepsin: Stomach : Trypsin : Duodenum.
- Pepsin: Stomach : Trypsin: Stomach.
- Pepsin: Duodenum : Trypsin : Duodenum.
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Enzymes work best at their optimum pH, which depends on where they are secreted.
Step 2: Pepsin
Pepsin is secreted by gastric glands and works in strongly acidic gastric juice at pH about 2. So it acts in the stomach.
Step 3: Trypsin
Trypsin comes from the pancreatic juice and is activated in the duodenum. It works in the alkaline medium there at pH about 9.5.
Step 4: Conclusion
So pepsin is in the stomach and trypsin is in the duodenum.
Final Answer:
Pepsin acts in the stomach and trypsin acts in the duodenum. \[ \boxed{\text{(B) }\text{Pepsin: Stomach : Trypsin : Duodenum.}} \]
Enzymes work best at their optimum pH, which depends on where they are secreted.
Step 2: Pepsin
Pepsin is secreted by gastric glands and works in strongly acidic gastric juice at pH about 2. So it acts in the stomach.
Step 3: Trypsin
Trypsin comes from the pancreatic juice and is activated in the duodenum. It works in the alkaline medium there at pH about 9.5.
Step 4: Conclusion
So pepsin is in the stomach and trypsin is in the duodenum.
Final Answer:
Pepsin acts in the stomach and trypsin acts in the duodenum. \[ \boxed{\text{(B) }\text{Pepsin: Stomach : Trypsin : Duodenum.}} \]
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