This image here depicts the general layout of the human digestive system (The Gale Encyclopedia of Science 2010).
When people with celiac disease eat foods or use products containing gluten, their immune system responds by damaging or destroying villi in the intestine. Villi allows nutrients from food to be absorbed into the bloodstream; without healthy villi, a person becomes malnourished, regardless of the quantity of food eaten (The Gale Encyclopedia of Medicine 2012).
This image here is a picture depicting the digestive process with key details (The Gale Encyclopedia of Science 2010).
An internal view of the mouth and pharynx, or throat. The throat serves the digestive system by allowing the passage of solid food and liquids (Body by Design 2010).
This illustration shows the parts of the human mouth: lips, upper jaw, mucous membranes, nasal passages, hard palate, soft palate, uvula, pharynx, tonsils, tongue, lower jaw, and teeth (Gale Science in Context 2010).