APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The secretion that lubricates the food so it moves easily through the digestive tract and also protects the epithelium is called what? This is called mucus. What is absorbed in the GI tract without being digested? This happens with vitamins.

Detailed explanation-2: -Mucus, secreted along the entire digestive tract, lubricates the food and the lining of the tract. The mucus coats and protects the epithelial cells of the digestive tract from mechanical abrasion, from the damaging effect of acid in the stomach, and from the digestive enzymes of the digestive tract.

Detailed explanation-3: -Gastric mucus is a glycoprotein that serves two purposes: the lubrication of food masses in order to facilitate movement within the stomach and the formation of a protective layer over the lining epithelium of the stomach cavity.

Detailed explanation-4: -Goblet cells are a specialized type of epithelial cell that secrete mucins (any of the class of glycoproteins found in mucus e.g. saliva, gastric juice, secreted by mucous membranes) which are significant components of mucus.