Secretion of gastric juice is controlled by

Options

A. Gastrin
B. Cholecystokinin
C. Enterogastrin
D. None of these

Answer

To answer the question regarding the control of gastric juice secretion, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Gastric Juice**: Gastric juice primarily consists of hydrochloric acid (HCl), pepsinogen, and intrinsic factor. It is secreted by the stomach lining and is essential for digestion.

2. **Control Mechanisms**: The secretion of gastric juice is regulated by both nervous and hormonal mechanisms. This means that various factors can influence how much gastric juice is produced.

3. **Identifying Key Hormones**: Among the hormones that play a role in gastric juice secretion, we need to consider the options provided:
- **Gastrin**: A hormone produced by G cells in the stomach lining that stimulates gastric acid secretion.
- **Cholecystokinin (CCK)**: Primarily involved in the digestion of fats and proteins and does not significantly stimulate gastric acid secretion.
- **Enterogastrin**: A hormone that inhibits gastric secretion but is not a primary stimulant.
- **None**: This option suggests that none of the above hormones control gastric juice secretion.

4. **Role of Gastrin**: Gastrin is the most significant hormone in stimulating gastric acid secretion. It acts on the parietal cells in the stomach to increase the production of HCl. Gastrin also stimulates the release of histamine from enterochromaffin-like (ECL) cells, which further enhances acid secretion.

5. **Conclusion**: Based on the above understanding, the correct answer to the question is **Gastrin**.

### Final Answer:
The secretion of gastric juice is controlled by **Gastrin**.

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