Across
- 2. Two branching tubes.
- 6. Wind pipe that filters and moisturizes the air.
- 7. Hollow area in the head that has sensory receptors that enable a person to smell. (Two words)
- 9. Very small blood vessels.
Down
- 1. Keeps food out of the lungs.
- 3. Smaller tubes on the respiratory system.
- 4. Pair of flaps called the voice box.
- 5. Air-filled organs located on either side of the chest.
- 8. Also called the throat, it opens and closes like a door.
- 10. Dead ends, bubble-like sacs.