The question is why? What creates that low PH? What gives our stomach such a high acidity? So the answer is these parietal cells, parietal cells are responsible for generating hydrochloric acid and releasing that hydrochloric acid into our ducks and ultimately into the lumen of the stomach. So parietal cells produce and secrete hydrochloric acid, which serves several important purposes. There are four purposes that you have to be familiar with.