Secretin hormone stimulates `:`

Options

A. Gastric glands
B. Pancreas
C. Gall bladder
D. Crypts of Lieberkuhn

Answer

**Step-by-Step Solution:**

1. **Understanding Secretin**: Secretin is a peptide hormone produced in the S cells of the duodenum, which is the first part of the small intestine.

2. **Functions of Secretin**: The primary functions of secretin include:
- Regulating the pH of the duodenum.
- Stimulating the pancreas to release bicarbonate.
- Stimulating the liver to produce bile.

3. **Regulating pH**: Secretin helps maintain an alkaline pH in the small intestine by inhibiting gastric acid secretion from the stomach. This is crucial because the food coming from the stomach is acidic, and the enzymes in the small intestine require a more alkaline environment to function effectively.

4. **Identifying the Correct Stimulus**: Among the options given:
- **Gastric glands**: Secretin does not stimulate gastric glands; instead, it inhibits their secretion.
- **Pancreas**: Secretin stimulates the pancreas to release bicarbonate, which is correct.
- **Gallbladder**: Secretin does not have a direct influence on the gallbladder.
- **Crypts of Lieberkühn**: These are intestinal glands where secretin is produced, but it does not stimulate them.

5. **Conclusion**: The correct answer is that secretin stimulates the pancreas.

**Final Answer**: Secretin hormone stimulates the pancreas.

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