And so that's why we want to swallow that mucus or food that contains the pathogens because we know that pathogens will eventually die as a result of the high acidity of that stomach. So basically the PH is around to inside our stomach when the stomach is in the process of digestion. So we see that these barriers don't only prevent the pathogens from actually entering our blood and our tissue, but they also create an inhospitable environment in which pathogens cannot actually grow. Now let's suppose we get a cut in our skin and what that means is the skin essentially fails in preventing the movement of pathogens because now that we have a cut that pathogen will have no problem making its way into the tissues of our body. So once the anatomical physical barriers are breached and the pathogen makes its way into our tissue or into our blood, what happens is the innate immune system responds in another way. It responds by initiating a process known as inflammation and more specific acute inflammation.