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