Chemical & Physical Barriers

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Across
  1. 6. A sticky substance in the nose and airways that traps pathogens.
  2. 8. structures that make it difficult for pathogens to get past them and into the body
  3. 9. The enzyme found in tears
  4. 10. A protective covering that forms over a wound to help it heal.
Down
  1. 1. Harmful microorganisms that cause disease.
  2. 2. Strong digestive acid in the stomach that kills swallowed pathogens.
  3. 3. Part of the body that filters air using hairs and sticky mucus.
  4. 4. Liquid produced by the eyes that contains enzymes to kill bacteria.
  5. 5. substances produced by the body cells that trap or kill pathogens
  6. 7. Tiny hair-like structures in the airways that move mucus up to the throat.
  7. 10. The body’s outer layer that acts as a physical barrier to stop pathogens entering.