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