It calls upon macrophages and oleukocytes that essentially engulf the pathogens as well as our infected cells. Now, while this process is taking place and while the innate immune system is preventing the spreading of this pathogen of this infection the adaptive immune system also known as the quiet immune system the other part of our immune system begins to mobilize itself. It begins to gear up to basically help fight that infection. Now, we know the innate immune system begins to act immediately following infection but our adaptive immune system actually takes several days before it is actually fully active and fully functional. Now, unlike the innate immune system which uses nonspecific mechanisms the adaptive immune system actually uses specific defense mechanisms because it uses antigens and antibodies as we'll see in just a moment. Now, the innate immune system cannot actually learn from infections but as we'll see in just a moment the adaptive immune system can actually learn from the different types of infections and pathogens that infect the body.