Body defence system

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Across
  1. 3. trail: bacteria leave these behind. This allows the white blood cells to trace them.
  2. 5. a creature that is only 1 cell big.
  3. 6. system:This has all the cells that that hunt and destroy germs.
  4. 11. a bacterium, virus, or other microorganism that can cause disease.
  5. 13. another name for a white blood cell.
  6. 15. diseases that cannot be passed on from one person to another.
  7. 16. First line defence: germs that have passed in here are destroyed by acid. Also the good bacteria line along its wall to prevent the bad bacteria from coming through.
  8. 17. First line defence: hair and mucus trap the germs.
Down
  1. 1. a white blood cell that swallows germs.
  2. 2. a type of leukocyte that stick antibodies on the germs, so other white blood cells can kill them.
  3. 4. node: Here a lot of white blood cells, waiting for a signal and ready to attack pathogens.
  4. 5. marrow: This is where the white blood cells are made.
  5. 7. saliva can trap and kill bacteria.
  6. 8. cell: A cell in your body that has mutated and is starting to reproduce wildly.
  7. 9. it is the biggest lymphatic organ and kills bacteria.
  8. 10. diseases that can be passed on to others.
  9. 12. sweat and oil have chemicals that can kill the bacteria.
  10. 14. Some white blood cells make these and stick them on germs so that other white blood cells can kill them.