And we'll discuss these cells in more detail in a future lecture. But these parietal cells found inside the stomach secrete gastric acid that contains hydrochloric acid and this lowers the PH and makes our stomach much more acidic. And this in turn activates the proteolytic enzymes that basically cleave our proteins. So inside our stomach, not only do we have mechanical digestion taking place, but we also have chemical digestion. Basically, the enzymes break down our peptide, the polypeptides, into their amino acids as well as into smaller peptides. Now, inside the stomach, we have ultimately no absorption taking place.