Across
- 2. help protects the organs in the chest.
- 4. a lung.
- 6. it sends oxygen to our lungs.
- 7. One of a pair of organs in the chest that supplies the body with oxygen.
- 8. the passive movement of molecules.
- 9. A large airway that leads from the trachea
- 10. it carry's air in and out of your lungs.
Down
- 1. A tiny branch of air tubes in the lungs.
- 3. where the lungs and the blood exchange oxygen and carbon dioxide.
- 5. helps organisms grow, reproduce.
- 8. the major muscle of respiration.