Across
- 2. the gas that our body needs to survive
- 3. to breathe out
- 6. the strong muscle layer below the lungs that opens the chest area up so the lungs can take in air
- 7. to breathe in
- 8. Air _____ are surrounded by blood vessels so that the blood can carry oxygen away from the lungs and to the body.
Down
- 1. the two branching tubes that air from the trachea goes down.
- 4. the spongy sac-filled organs that we use to breathe
- 5. The strong tube with ridges that takes the breath toward our lungs