The respiratory system
Across
- 6. membrane that helps the lungs move easily.
- 7. bones that protect the lungs.
- 9. moves the chest during breathing.
- 10. a tube that carries air down to the lungs.
- 11. tiny air sacs for gaseous exchange.
Down
- 1. a muscle that controls the volume of the chest.
- 2. takes air down to the bronchus.
- 3. very narrow tubes that carry air to the alveoli.
- 4. a machine that takes over breathing for the body when disease causes the lungs to fail.
- 5. a flap of skin that prevents food going into the trachea.
- 8. the movement of a substance from where it is in high concentration to where it is in lower concentration.