Across
- 2. large air tube from the trachea into the lungs
- 4. has two nostrils
- 6. main muscle located below the lungs
- 9. the front of the neck
Down
- 1. spongy air filled organ
- 2. tiny branches of air tubes within the lungs
- 3. has about 20 rings
- 5. helps us make sounds
- 7. where the lungs and blood exchange O2 and CO2
- 8. used for eating