Respiratory system
Across
- 2. the voice box
- 3. the throat
- 5. a large flat sheet of muscle that controls movement of air in and out of the lungs
- 6. a flap of tissue that closes when you swallow to prevent food from entering the airway
- 7. a passage in which air moves to the respiratory system
Down
- 1. two tubes that break up into each lung
- 4. an organ that exchanges oxygen and carbon dioxide