Respiratory System

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Across
  1. 2. The alveoli have _______ linings.
  2. 7. The reaction that we call burning.
  3. 8. Where gas exchange takes place.
  4. 10. The gas produced by respiration.
  5. 11. The muscle that controls the size of your lungs.
  6. 13. .________ Priestly discovered oxygen.
Down
  1. 1. The bones that protect your lungs.
  2. 3. Another word for a windpipe
  3. 4. The alveoli have _____ walls.
  4. 5. The alveoli have a large ______ _____.
  5. 6. The movement of gases from a high to a low concentration.
  6. 9. The gas mad by photosynthesis.
  7. 12. The animal that was used to help discover oxygen.