Respiratory System

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Across
  1. 6. The release of energy from food
  2. 7. This muscle contracts and relaxes to help us breathe (9 letters)
  3. 8. The flap that covers the windpipe during swallowing (9 letters)
  4. 12. Tiny structures in the lungs where oxygen and carbon dioxide are exchanged (7 letters)
  5. 13. Substance in the nose that filters air (5 letters)
  6. 14. Organ where gas exchange occurs (5 letters)
Down
  1. 1. The branches of tubes that carry air in the lungs(11 letters)
  2. 2. The process of breathing in (10 letters)
  3. 3. The gas we need for survival (6 letters)
  4. 4. The movement of gasses (9 letters)
  5. 5. Tiny blood vessels with walls 1 cell thick (11 letters)
  6. 9. Structures that vibrate to produce sound (6 letters)
  7. 10. The windpipe that connects the throat to the lungs (7 letters)
  8. 11. Tube that branches from the trachea into the lungs (7 letters)