Across
- 4. The muscle that helps us inhale and exhale.
- 6. Brings deoxygenated blood to the lungs from the heart.
- 8. The outer covering of the lungs.
- 9. The singular form of bronchus. The trachea divides into this.
- 10. The vocal box of the body.
- 11. We breath in this gas.
- 12. A passage that leads from the mouth to the lungs.
Down
- 1. Also called air-sacs.
- 2. The passage where air is warmed, humidified and purified.
- 3. We breath out this gas.
- 5. Samllest of the respiratory branches.
- 6. Brings oxygenated blood to the heart from the lungs.
- 7. Breathing out.