Which hormone acts on the gastic glands, and stimulates the secretion of hydrochloric acid and pepsinogen?

Options

A. Renin
B. Glucagon
C. Insulin
D. Gastrin

Answer

To solve the question "Which hormone acts on the gastric glands, and stimulates the secretion of hydrochloric acid and pepsinogen?", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Hormones Listed**: The question provides several hormones: rennin, glucagon, insulin, and gastrin.

2. **Understand the Functions of Each Hormone**:
- **Rennin**: This hormone is primarily involved in the regulation of blood pressure and fluid balance, secreted by the kidneys.
- **Glucagon**: This hormone raises blood glucose levels by converting glycogen to glucose in the liver.
- **Insulin**: This hormone lowers blood glucose levels by facilitating the uptake of glucose into cells.
- **Gastrin**: This hormone is secreted by G cells in the stomach and stimulates gastric glands.

3. **Focus on Gastrin**: Since the question specifically asks about the hormone that acts on gastric glands, we need to focus on gastrin. Gastrin is known to stimulate the secretion of hydrochloric acid (HCl) and pepsinogen from the gastric glands.

4. **Conclusion**: Based on the functions of the hormones, gastrin is the correct answer as it directly stimulates the gastric glands to secrete hydrochloric acid and pepsinogen.

5. **Final Answer**: The hormone that acts on the gastric glands and stimulates the secretion of hydrochloric acid and pepsinogen is **gastrin**.