Across
- 3. tiny tubes that take air to alveoli
- 7. the system that brings in oxygen to the body
- 10. flap that keeps food from entering larynx
- 11. gas that we breathe in
- 12. main organ of the respiratory system
Down
- 1. tiny air sacs where gas are exchanged
- 2. commonly known as the windpipe
- 4. makes up rings on trachea that make it rigid
- 5. the common pathway for air and food
- 6. lined with cilia and mucus to filter air
- 8. carbon _______ is the gas we breathe out
- 9. muscle that causes lungs to expand