Respiratory System

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Across
  1. 3. main muscle of breathing
  2. 5. main air passages entering lungs
  3. 6. instrument to measure lung volumes
  4. 9. barrier for gas diffusion
  5. 11. unequal chest movement
  6. 12. reduces alveolar surface tension
  7. 14. lung’s ability to expand
  8. 15. air not involved in gas exchange
Down
  1. 1. negative pressure in pleural cavity
  2. 2. pressure inside lungs
  3. 4. tiny air sacs for gas exchange
  4. 7. maximum air exhaled after deep breath
  5. 8. nerve supplying diaphragm
  6. 10. double membrane covering lungs
  7. 13. windpipe of respiratory system