Across
- 2. Gas we breathe IN
- 5. Breathe IN
- 6. Windpipe
- 8. Tubes that lead to the lungs
- 9. Where oxygen from the air is transferred to the blood
Down
- 1. dioxide Gas we breathe OUT
- 3. Breathe OUT
- 4. A muscle under the lungs to help them inhale
- 7. Sticky substance in the nose that traps particles