Respiratory System Crossword

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Across
  1. 3. Lungs and ______ are the two major structures of the respiratory system.
Down
  1. 1. The purpose of the respiratory system is to supply the body with ______.
  2. 2. _______ cells will die in 4-6 minutes without oxygen.
  3. 3. Disease of the lungs that causes shortness of breath, chest tightness, and difficulty breathing.