Across
- 1. to keep our respiratory system healthy we should avoid _______ places
- 5. are millions of tiny air sacs in the lungs
- 6. protect the lungs
- 9. oxygen passes through the nose or mouth and passes through this tube
Down
- 2. flat sheet of muscle extending across the bottom of the rib cage
- 3. system that consists of the nose, the mouth, the trachea, and the lungs.
- 4. it is important to keep our respiratory system _______
- 7. two smaller tubes on each side of the lungs
- 8. filters the air that we breathe in