Respiratory System

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Across
  1. 6. The process of producing energy using sugar and oxygen
  2. 7. tubes Tubes which leads from windpipe to each lung
  3. 8. Taking air into the lungs
  4. 10. Allows air to enter and leave the body
Down
  1. 1. A substance that moistens the air as well as trapping foreign substances
  2. 2. Muscle located under the lung
  3. 3. Bone structure which protects the heart and lungs
  4. 4. Filters the air we inhale and branches into the windpipe
  5. 5. Letting air out of the lungs
  6. 9. Main organ of the respiratory system