__________ shows gastric contractions and inhibit the secretion of gastric juice.

Options

A. Gastrin
B. Secretin
C. Entero- gastrone
D. Inhibin

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a substance that shows gastric contractions and inhibits the secretion of gastric juice. We need to identify which enzyme or hormone fulfills this role.

2. **Analyzing the Options**:
- **Gastrin**: This hormone stimulates the secretion of gastric acid (HCl) in the stomach and promotes gastric motility. Therefore, it does not inhibit gastric contractions or secretion.
- **Cretin**: This is not a relevant term in the context of gastric function. It seems to be a misinterpretation of "cholecystokinin" or "cretinism," which are not directly related to gastric inhibition.
- **Enterogastron**: This is a hormone secreted by the mucosa of the duodenum. It plays a role in providing negative feedback to the stomach, inhibiting gastric contractions and the secretion of gastric juices when there is sufficient digestion occurring in the small intestine.
- **Inhibin**: This is a gonadal hormone that regulates reproductive functions and does not have a role in gastric function.

3. **Identifying the Correct Answer**: Based on the analysis, the substance that inhibits gastric contractions and the secretion of gastric juice is **Enterogastron**.

4. **Final Answer**: Enterogastron shows gastric contractions and inhibits the secretion of gastric juice.

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