Across
- 3. it collects the air
- 4. pipe that send air to your lungs
- 6. what we breath out
- 8. a hole you breath from
- 10. small air tubes
- 11. a thin skeletal muscle
- 12. high concentration and low concentration
Down
- 1. very tiny blood cells
- 2. where the lungs and the blood exchange
- 5. has twelve on each side
- 7. found at end of trachea
- 9. what u breath in