So it has a certain capacity, about two liters of capacity, to basically store that food. Now, the stomach also consists of specialized types of cells and these cells basically secrete different types of enzymes and different types of substances. For example, a cell known as the parietal cell. 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.