Medically reviewed by Robert Burakoff, MD Intestinal villi (singular: villus)are tiny, finger-like projections that line the interior (lumen) of the small intestine. The primary function of villi is ...

ranging from the highly acidic environment in the stomach lumen to largely neutral conditions at the outermost layer of the stomach epithelial cells, which is protected by a mucus layer.

Heartburn and acid reflux effect millions of Americans. Medications for treating acid reflux seek to neutralize stomach acid or prevent the production of it. While they are generally well tolerated, ...