So, by releasing hydrochloric acid, we ultimately decrease the PH and increase the acidity of the lumen of the stomach. And that stimulates our chief cells to release our Pipsinogen into our stomach lumen. Secondly, it actually activates aropipcinogen, it transforms it into pepsin the active form of the enzyme it also denatures it breaks down the three dimensional shape of the protein into its primary sequence to basic and that basically allows our pepsin to actually cleave those bonds. And as a result of that low PH that low PH can also kill off our bacterial cells that enter our stomach along with our food. Now parietal cells don't only secrete hydrochloric acid they are also responsible for producing a glycoprotein known as the gastric intrinsic factor. And this intrinsic factor is basically responsible for allowing the small intestine as we'll see in the next lecture to basically absorb an important type of vitamin known as B twelve.