Question

In human digestive system, the enzymes pepsin and trypsin are secreted respectively by which organs?

• A. Pancreas and liver
• B. Stomach and salivary glands
• C. Pancreas and gall bladder
• D. Stomach and pancreas

Answer 1

The correct option is D

Stomach and pancreas

The correct option is option D.

The explanation for correct answers:

1. Pepsin and trypsin are important digestive enzymes secreted respectively by the stomach and pancreas.
2. Pepsin: It is secreted by gastric chief cells present in the stomach.
3. It helps digest protein in the food.
4. Pepsin requires an acidic medium to exert its action and so the acid secreted serves this function.
5. Trypsin: It is a protease of the digestive system produced in the pancreas as an inactive precursor trypsinogen.
6. It is then secreted into the small intestine, where enterokinase proteolytic cleavage activates trypsin.

The explanation for incorrect answers:

Option A:

1. The pancreas secretes trypsin.
2. Trypsin is secreted into the small intestine for the digestion of protein.
3. The liver secretes bile which helps in the digestion of lipids.
4. It helps in the emulsification of lipids.

Option B:

1. Stomach secrets the pepsin.
2. They are secreted by gastric cells in the stomach.
3. But trypsin is not secreted by salivary glands.
4. Salivary glands secret saliva which contain salivary enzyme.
5. Salivary enzymes break down starch into simple sugar molecules.

Option C:

1. Trypsin is secreted by the pancreas.
2. It helps in the digestion of protein.
3. The gall bladder stores the bile produced by the liver.
4. It is located just under the liver.
5. Bile helps in the emulsification of fat.

Final answer: In the human digestive system, the enzymes pepsin and trypsin are secreted by the stomach and pancreas respectively.