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2. Gastrointestinal wall - Wikipedia

   en.wikipedia.org/wiki/Gastrointestinal_wall

   The normal thickness of the small intestinal wall is 3–5 mm, [6] and 1–5 mm in the large intestine. [7] Focal, irregular and asymmetrical gastrointestinal wall thickening suggests a malignancy. [ 7 ]

3. Intestinal epithelium - Wikipedia

   en.wikipedia.org/wiki/Intestinal_epithelium

   The intestinal epithelium is the single cell layer that forms the luminal surface (lining) of both the small and large intestine (colon) of the gastrointestinal tract. Composed of simple columnar epithelium its main functions are absorption, and secretion. Useful substances are absorbed into the body, and the entry of harmful substances is ...

4. Human feces - Wikipedia

   en.wikipedia.org/wiki/Human_feces

   Human feces photographed in a toilet, shortly after defecation.. Human feces (American English) or faeces (British English), commonly and in medical literature more often called stool, [1] are the solid or semisolid remains of food that could not be digested or absorbed in the small intestine of humans, but has been further broken down by bacteria in the large intestine.

5. Gastrointestinal perforation - Wikipedia

   en.wikipedia.org/wiki/Gastrointestinal_perforation

   Gastrointestinal perforation is defined by a full-thickness injury to all layers of the gastrointestinal wall, resulting in a hole in the hollow GI tract (esophagus, stomach, small intestine, or large intestine). A hole can occur due to direct mechanical injury or progressive damage to the bowel wall due to various disease states.

6. Upper gastrointestinal series - Wikipedia

   en.wikipedia.org/wiki/Upper_gastrointestinal_series

   Barium X-ray examinations are useful tools for the study of appearance and function of the parts of the gastrointestinal tract. They are used to diagnose and monitor esophageal reflux, dysphagia, hiatus hernia, strictures, diverticula, pyloric stenosis, gastritis, enteritis, volvulus, varices, ulcers, tumors, and gastrointestinal dysmotility, as well as to detect foreign bodies.

7. This Is What It Really Means When Your Poop Is Green - AOL

   www.aol.com/really-means-poop-green-193600731.html

   Digestive contents in the gut initially appear green/yellow due to bile made by the liver and secreted by the gallbladder at the start of the small intestine, but this pigment turns brown as it ...