Duodenal glands which prevent corrosion by HCl of chyme are

Options

A. Oxyntic cells
B. Peptic cells
C. Bunner's glands
D. Crypts of Lieberkuhn

Answer

To answer the question regarding which duodenal glands prevent corrosion by HCl of chyme, let's break down the information step by step.

### Step-by-Step Solution:

1. **Understanding the Duodenum**: The duodenum is the first part of the small intestine, which receives chyme from the stomach. This chyme is acidic due to the presence of hydrochloric acid (HCl) that is secreted in the stomach.

2. **The Problem of Acidity**: When the acidic chyme enters the duodenum, it can potentially corrode the intestinal walls if not neutralized. Therefore, it is crucial to neutralize the acidity to protect the intestinal lining.

3. **Role of Duodenal Glands**: To counteract the acidity of the chyme, specific glands in the duodenum secrete substances that help neutralize the pH.

4. **Identifying the Correct Glands**: Among the options provided:
- **Auxintic cells**: These are located in the stomach and secrete hydrochloric acid, so they are not involved in neutralizing chyme.
- **Peptic cells**: Also found in the stomach, these cells secrete pepsin, which digests proteins, and do not neutralize acidity.
- **Brunner's glands**: These are the correct glands located in the duodenum that secrete bicarbonate (hydrogen carbonate) to neutralize the acidic chyme.
- **Crypts of Lieberkühn**: These are intestinal glands that secrete enzymes and mucus but do not primarily function to neutralize acidity.

5. **Conclusion**: The correct answer is **Brunner's glands**, as they secrete bicarbonate to neutralize the HCl present in the chyme, thus preventing corrosion of the intestinal walls.

### Final Answer:
**Brunner's glands** are the duodenal glands that prevent corrosion by HCl of chyme.