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How does the immune system protect us from pathogens?

How does the immune system protect us from pathogens? . Pathogens. Disease in Humans may be caused by foreign invaders called: pathogens or microbes. Examples of Pathogens. Bacteria Virus Fungus. The Immune System. The immune system is the body’s primary defense against:

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How does the immune system protect us from pathogens?

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  1. How does the immune system protect us from pathogens?

  2. Pathogens • Disease in Humans may be caused by foreign invaders called: pathogens or microbes

  3. Examples of Pathogens • Bacteria • Virus • Fungus

  4. The Immune System • The immune system is the body’s primary defense against: Disease causing pathogens

  5. Pathogens • Antigens – protein on the surface of the pathogen that triggers the immune system

  6. Immune System White blood cells produce antibodies – identify and neutralize antigens

  7. Antibodies • Antibodies attach to the antigen when the shape fits • Why does it attach there? It marks the bacteria so the white blood cells knows to eat it up or engulf it

  8. Differences in antibodies • Can these two pathogens be marked by the same antibody? Explain why or why not. No, because the antigens on each bacteria has a different shape. The antibody also has a shape and has to fit onto the antigen on the bacterial cells surface. Antibodies are pathogen specific 1 Bacteria Bacteria 2

  9. White Blood Cells • They engulf invaders • Others produce antibodies that mark pathogens so they can be killed • Some white blood cells remain to fight pathogens if they return

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