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Immune System Notes p. 10 Describe the purpose of the immune system 1st line of defense 2nd Line of Defense (Inflammatory Response): 3rd line of defense (Immune Response): How does this help your body in the future? To keep your body healthy & battle off pathogens. -Barriers trap & kill most pathogens - Skin - Breathing Passage (mucus, sneezing, coughing) - Mouth & Stomach (chemicals destroy germs) -Special White Blood Cells engulf & destroy pathogens -Inflammation brings more blood flow and white blood cells to area -Fever Different types of White Blood Cells distinguish between different kinds of pathogens & react with a defense targeted at it. Produce antibodies- special protein that helps destroy germ -White Blood Cells remember pathogen -Unlikely to get same disease again unless different version Vaccination -Contains weakened or killed pathogens -Produces Antibodies to help the body recognize germ if exposed to the real thing