Across
- 2. capacity 6000ml
- 3. passage for air to enter lungs
- 5. intercostal muscles relax
- 7. cavity main airway for inhaled air
- 8. air needed to purify blood
- 10. separates the nasal from the mouth
Down
- 1. intercostal muscles contract
- 4. exchange of gases
- 5. flap at the back of the throat
- 6. wind pipe divides into bronchi
- 9. muscle separating the thorax from the rest of the body