Across
- 3. structures that are responsible for breathing
- 4. the windpipe
- 6. the flap of tissue that separates the larynx and pharynx
- 8. a respiratory disease that can be treated with antibiotics
- 9. structures with alveoli at the end
Down
- 1. structures that branch off from the trachea
- 2. structures that exchange oxygen and carbon dioxide
- 5. the muscle that helps the lungs expand and contract
- 6. one way to keep the respiratory system healthy
- 7. the gas taken into the body by the lungs