Well, basically, if we ingest any type of food that contains a pathogen, or if the pathogens inside the mucous membrane are eventually expelled into our stomach. The reason this actually takes place is because inside our stomach we have specialized types of cells known as parietal, cells that are responsible for secreting a very acidic substance known as hydrochloric acid. And the hydrochloric acid creates a very low PH, a very acidic environment that most pathogens cannot actually survive in. On top of that, our skin, our mouth and eyes also contain special types of glands that secrete other fluids that contain enzymes such as lysozymes that can essentially kill off our bacterial cells pathogens because they break down the cell membrane of those bacterial cells. Now, the fourth type of Innate Immunity section is the phagocytes and neutrophils. These are two types of cell specialized immune cells that are part of the innate immunity response.