Across
- 3. two main branches into lungs
- 4. smaller airways in the lungs
- 5. breathing in
- 10. air moved in one breath
- 11. total volume of air breathed per minute
- 13. windpipe
Down
- 1. main muscle for breathing
- 2. site of gas exchange
- 6. gas absorbed into blood
- 7. breathing out
- 8. gas removed from blood
- 9. starting point of airflow
- 12. breaths per minute