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IMMUNE SYSTEM: The Body’s Defenses – Section 9 Teacher notes Word Attack Pathogens Inflammatory response Phagocyte Immune system lymphocytes antigens antibodies barriers Vocabulary 1. Barriers like your skin keep pathogens from getting into your body. Pathogens cause disease. 2. If pathogens get past the barrier of your skin, the inflammatory response helps attack the pathogens. It is called the body’s general defense. 3. A white blood cell that surrounds the pathogen and destroys it is called a phagocyte. 4. If the inflammatory response is not enough to overcome the pathogen, the next way your body fights disease is with the immune system. 5. White blood cells called lymphocytes are part of the immune system. 6. Antigens are part of your cells that the immune system recognizes as being a normal part of you or being from another source outside your body. . It is like the uniform that helps you determine which team is the home team and which team is the team from far away. 7. Antibodies latch on to antigens like a jigsaw puzzle piece an mark it for destruction. Fill in the blanks 1. Your skin creates a ____barrier__________ that keeps dirt and germs out of your body. 2. Another word for a germ that causes disease is a ______pathogen________________. 3. There are 2 types of white blood cells that help fight disease. The kind that surrounds and destroys it is called a __________phagocyte______________. T cells and B cells in the immune system are white blood cells called _________lymphocyte___________. 4. The ‘uniform’ on cells that label a cell as being friendly to your body or foreign to your body are called __________antigen_______. 5. ____Antibodies_______________ are chemicals that lock onto antigens and label it for destruction. Barriers first line of defense 1. Skin – sweat, oil, dead skin cells 2. Breathing passages – cough and sneeze 3. Mouth and stomach – saliva and stomach acid General defenses second line of defense inflammatory response Latin root “to set on fire” Swelling, warm to touch May have a fever Phagocytes WBC that engulfs pathogens Immune System third line of defense Specific response to a specific pathogen Lymphocytes – another type of WBC T cells – identify pathogen Antigen – uniform of the pathogen B cells – produce chemicals to destroy pathogens Antibodies – chemicals that lock onto antigens AIDS – acquired immunodeficiency syndrome Virus that attacks the immune system People may have virus for years before they become sick Not spread through shaking hands, hugging Is spread through Blood Infected paraphernalia of drug users Infected blood transfusions Sexually transmitted disease Infected mother to baby during pregnancy