Lysozyme is found in tears and saliva which can destroy the cell walls of most bacteria. Gastric juices kill off bacteria in food. Mucus captures bacteria in the nose and throat cavities of the body. Phagocytes and Natural Killer Cells Phagocytes are cells that eat other cells or objects found in the body. Macrophages a type of phagocyte that eats bacteria, viruses, and the debris of damaged cells.
Neutrophils are another type of white blood cell capable of becoming phagocytotic.
Natural Killer Cells destroy the bodies own infected cells, especially those containing viruses. They may attack cells that might form tumors. Inflammatory Response Damage to tissue by physical injury will trigger an inflammatory response. Small blood vessels in the area will dilate and become leakier. This causes the redness and heat of the infected area.