The Respiratory System

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Across
  1. 2. Breathing out
  2. 5. The name of your windpipe
  3. 6. Substance that traps germs
  4. 8. The gas our tissues need to survive
  5. 9. The site of gas exchange
  6. 10. Large muscle that helps with breathing
Down
  1. 1. The main organs of the respiratory system
  2. 3. Breathing in
  3. 4. Branches off the windpipe
  4. 7. Hair-like structures that line the respiratory tract