Across
- 2. muscle that works with your lungs
- 4. the waste that exhales from the body
- 7. small air tubes
- 8. sends oxygen into cells
- 10. responsible for your sense of smell
- 11. the smallest blood vessel
Down
- 1. change of density
- 3. the organ responsible for you breathing
- 5. a chemical that you breathe
- 6. air sacs for the lungs
- 7. airways for the lungs
- 9. protection for the lungs