Across
- 2. Windpipe connecting throat to lungs.
- 5. The sound-making organ in the throat.
- 6. Main tube that branches into the lungs.
- 7. Coats the lungs to prevent collapse.
- 9. Breathing out carbon dioxide.
- 10. Protective flap over the windpipe during swallowing.
Down
- 1. Smallest airways before the alveoli.
- 3. Muscle sheet that helps in breathing.
- 4. The organ where gas exchange takes place.
- 8. Tiny hair-like structures that clean the airways.