In case of hypersecretion of gastrin in gastrinoma (Zollingers – Ellison Syndrome) stimulate the parietal cells of the stomach to secrete acid to their maximal capacity and increase the parietal cell mass three to six fold. The acid output may be so great that it reaches the upper small intestine reducing the luminal pH to two or less. | In case of hypersecretion of gastrin in gastrinoma (Zollingers – Ellison Syndrome) stimulate the parietal cells of the stomach to secrete acid to their maximal capacity and increase the parietal cell mass three to six fold. The acid output may be so great that it reaches the upper small intestine reducing the luminal pH to two or less. |