Brunner's glands secrete alkaline mucus to neutralize acid chyme in the duodenum. In which layer of the duodenum are Brunner's glands primarily located?

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Multiple Choice

Brunner's glands secrete alkaline mucus to neutralize acid chyme in the duodenum. In which layer of the duodenum are Brunner's glands primarily located?

Explanation:
Brunner's glands are specialized glands located in the submucosa of the duodenum. They secrete bicarbonate-rich alkaline mucus to neutralize the acidic chyme that comes from the stomach, creating a safer, more enzyme-friendly environment for intestinal digestion. The mucosa itself contains the surface epithelium and crypts, not these glands, while the muscularis externa and adventitia are muscle and outer connective tissue layers without glandular tissue. In the duodenum, these glands reside specifically in the submucosa, helping explain why this layer is the correct location.

Brunner's glands are specialized glands located in the submucosa of the duodenum. They secrete bicarbonate-rich alkaline mucus to neutralize the acidic chyme that comes from the stomach, creating a safer, more enzyme-friendly environment for intestinal digestion. The mucosa itself contains the surface epithelium and crypts, not these glands, while the muscularis externa and adventitia are muscle and outer connective tissue layers without glandular tissue. In the duodenum, these glands reside specifically in the submucosa, helping explain why this layer is the correct location.

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