First, Second & Third Lines of Defence

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Across
  1. 2. A response that increases blood flow to infected areas.
  2. 5. Raises body temperature to slow down or kill pathogens.
  3. 8. The body's first physical barrier against pathogens.
  4. 10. The process of engulfing and digesting pathogens.
  5. 13. A chemical that triggers inflammation and increases blood flow.
  6. 14. Proteins produced to neutralise specific pathogens.
  7. 15. A microorganism that causes disease.
  8. 16. A way to train the immune system using weakened or dead pathogens.
Down
  1. 1. Blood Cells – General name for cells that attack and destroy pathogens.
  2. 3. A sticky substance that traps pathogens in the respiratory system.
  3. 4. Fast-acting white blood cells that attack invaders.
  4. 6. Contains enzymes that help kill bacteria in the mouth.
  5. 7. Contain enzymes that break down bacterial cell walls.
  6. 8. Acid – Kills many ingested pathogens before they reach the intestines.
  7. 9. Foreign substances that trigger an immune response.
  8. 11. Tiny hair-like structures that sweep away mucus and trapped microbes.
  9. 12. Large white blood cells that engulf and digest pathogens.