Across
- 4. a waterproof barrier that keeps out microbes
- 6. the first and second lines are
- 9. the process which engulfs and digests pathogens
- 10. an antimicrobial substance found in tears
- 12. a body wide reaction to a pathogen
- 14. known as big eater
- 15. collection of lymph vessels that filter out germs
Down
- 1. a sticky liquid that traps pathogens
- 2. a reflex action that clears the nose
- 3. little hairs that line the nasal passages
- 5. red, hot, swollen and sore
- 7. white blood cells involved in immunity
- 8. a protein that helps attack viruses
- 11. an acidic liquid secreted by the skin
- 13. a reflex action that clears the trachea