Respiratory System

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