Advanced Dental Admission Test (ADAT)

What is the function of Brunner's glands found in the duodenum?

1. Secrete bile

2. Secrete alkaline mucus

3. Absorb nutrients

4. Produce digestive enzymes

The correct answer is: Secrete alkaline mucus

Brunner's glands, which are located in the submucosa of the duodenum, primarily function to secrete alkaline mucus. This alkaline secretion is crucial as it helps to neutralize the acidic chyme that is received from the stomach. The neutralization is important for protecting the intestinal lining from damage by the acidic contents and creating an optimal pH environment for the activity of intestinal enzymes and the overall digestive processes that take place in the small intestine. Additionally, the alkaline mucus secreted by Brunner's glands provides a lubricant that facilitates the passage of food through the intestine. This unique function is essential in maintaining a balanced intestinal environment, which is not directly served by the functions of bile secretion, nutrient absorption, or the production of digestive enzymes.