Respiratory System Crossword

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Across
  1. 2. the sheet of muscle that controls breathing
  2. 3. two airways that branch off the trachea
  3. 4. main airway
  4. 7. main organ of the circulatory system
  5. 8. main organs of the respiratory system
  6. 10. the gas that is exchanged from the lungs to the bloodstream
Down
  1. 1. ring-shaped structures that support the trachea
  2. 5. air sacs where gas exchange happens
  3. 6. the smallest airway branches
  4. 9. organ containing the vocal chords