Across
- 3. organ for the exchange of gas between blood and the atmosphere
- 5. an air-filled space above and behind the nose
- 6. the two tubes branching to the lungs
- 7. the tube that filters air before it enters the lungs
- 9. the amount of air that can fill lungs
- 10. the oxygen-carrying protein found in red blood cells
Down
- 1. a bubble-like sac in the lungs where gasses are exchanged
- 2. the part of the throat below the mouth and nasal cavity
- 4. the smallest blood vessels
- 6. the passageway where air flows to an alveolus
- 8. the flap that keeps food out of the lungs by shutting in front of the esophagus