Across
- 4. SYSTEM Body system responsible for breathing
- 6. Harmful waste gas that we need to get rid of
- 10. Tiny sacs surrounded by blood vessels
- 11. Help keeps your lungs healthy
- 13. Place where air can enter
- 14. Organs where the air exchange happens
Down
- 1. Invisible gas that we need for our cells to work properly
- 2. Main function of the respiratory system
- 3. Small passages (look like tree branches) inside the lungs
- 5. Dome shaped muscle
- 7. Bones that protect the lungs
- 8. The windpipe
- 9. Damages your lungs
- 12. Little hairs inside bronchial tubes that help remove unwanted matter from the lungs