Innate immune system is made of defenses against infection that can be activated through pathogen. includes physical barriers such as the skin, the gastrointestinal track, the respiratory tract, and pharynx, cilia, eyelashes and other body hair. Cells: Phagocytes (eating cell), macrophages (hunters), mast cells (healing from infla), Neutrophils (contain granules toxic bacteria), Eosinophils ( kill bacteria and parasites, first to go), basophils (attack muticellil;ar paracxsties), Natural killer cells (destroy inflected host cell), and dentric cells (located in tissue act as messengers).