Across
- 3. primary muscle used for breathing
- 9. this causes air to rush into the lungs
- 10. the larger of the two lungs
- 11. tube that food goes down
- 12. bone like structures that protect the trachea
Down
- 1. tiny blood vessels that surround the alveoli
- 2. muscle that closes the airway, blocks food
- 4. backup entrance for air
- 5. sticky substance that captures bacteria or dust
- 6. the muscles in between the ribs, helps breathing
- 7. primary entrance for air
- 8. hairs in the respiratory system that line the walls