Gallstones and biliary disease can be a bit confusing, and there is a lot of overlap. Essentially, gallstones themselves are not problematic in the vast majority of cases, but can predispose the other problems with the biliary tree. Gallstones
There are basically two regions in the stomach, which contain two different lots of cells, which have different functions: Oxyntic glandular area – this contains oxyntic (parietal cells) that secrete gastric juice and intrinsic factor, as well as chief (peptic cells) that secrete pepsinogen Antral (lower) region – this contains G cells that secrete gastrin. G cells are also found in the duodenum.