Across
- 2. – Voice box
- 6. – Regulation of breathing rhythm
- 7. – Substance that reduces surface tension in the lungs
- 8. Tree – Network of air passages in the lungs
- 12. – Small air sac in the lungs
- 14. – Small airway in the lungs
- 15. – Windpipe
Down
- 1. – Major airway in the lungs
- 3. – Throat region
- 4. Capacity – Maximum amount of air a person can exhale after maximum inhalation
- 5. – Group of organs working together
- 9. – Organs for breathing
- 10. Pressure – Pressure exerted by a gas in a mixture
- 11. – Thin layer in the respiratory system
- 13. Cavity – Air passage in the nose