The Respiratory System - Crossword

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