Across
- 2. The release of energy from food
- 8. Blood vessel that surrounds alveoli
- 9. A tube that carries air into a lung
- 10. To breathe air out
- 11. To take air in
- 12. Flap of skin that prevents food going into windpipe
- 14. Takes in air and filters it
Down
- 1. Very narrow tubes in the lungs
- 3. Muscle under the lungs that controls volume of lungs
- 4. Bones that protect the lungs
- 5. Tiny air sacs in lungs
- 6. Taking in oxygen and letting out carbon dioxide
- 7. Takes air down to lungs
- 13. Muscles that move the chest during breathing