Guyton & Hall - Physio - Gi Study Guide Rated A+

4. E) Vitamin B12 is absorbed in the ileum; this absorption requires intrinsic factor, which is a glycoprotein secreted by parietal cells in the stomach. Binding of intrinsic factor to dietary vitamin B12 is necessary for attachment to specific receptors located in the brush border of the ileum. Atrophic gastritis is a type of autoimmune gastritis that is mainly confined to the acidsecreting corpus mucosa. The gastritis is diffuse, and severe atrophy eventually develops. Ileal resection is likely to cause diarrhea but not constipation. A gastric ulcer is possible but relatively unlikely. GERD is caused by gastric acid and bile reflux into the esophagus; mucosal damage and epithelial cell transformation lead to Barrett esophagus, which is a forerunner to adenocarcinoma, a particularly lethal cancer.4. E) Vitamin B12 is absorbed in the ileum; this absorption requires intrinsic factor, which is a glycoprotein secreted by parietal cells in the stomach. Binding of intrinsic factor to dietary vitamin B12 is necessary for attachment to specific receptors located in the brush border of the ileum. Atrophic gastritis is a type of autoimmune gastritis that is mainly confined to the acidsecreting corpus mucosa. The gastritis is diffuse, and severe atrophy eventually develops. Ileal resection is