Across
- 2. upper part of your body
- 5. the muscles here assist in breathing
- 6. small tubes
- 9. helps produce breathing movements
Down
- 1. What surrounds each lung?
- 3. where gas exchange occurs
- 4. What is next to the intercostal muscles?
- 7. contracts when inhalation occurs
- 8. trachea branches into _______
- 10. also known as windpipe
- 11. organ in where ventilation occurs