MRCP UK EXAMINATIONS

ABDOMINAL

GASTROINTESTINAL

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

What does mucus do?

A	Digests food in the mouth.
B	Digests food in the stomach
C	Protects the stomach from digesting iteself
D	Absorbs nutrients from food so the body has energy.

Explanation:

Detailed explanation-1: -Gastric mucus is a gel-mucous barrier secreted by epithelial cells and glandular cells in the stomach wall. It acts as part of a barrier that protects the stomach wall from the acid and digestive enzymes within the stomach lumen.

Detailed explanation-2: -The stomach normally does not digest itself because of a mechanism which regulates gastric secretion. This checks the secretion of gastric juice before the content becomes sufficiently corrosive to damage the mucosa. Pure gastric juice can destroy the mucosa and produce a peptic ulcer.

Detailed explanation-3: -Like the colon, the stomach has a two-layered mucus system. The inner mucus layer, built around MUC5AC, acts as a diffusion barrier for hydrochloric acid. The surface epithelial cells secrete bicarbonate, creating a pH gradient from the acidic lumen to neutral pH at the cell surface.

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