The Respiratory System

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Across
  1. 2. The center of the respiratory system
  2. 4. helps you inhale and exhale
  3. 7. How many times do we breath per day(word that's a number, no spaces)
Down
  1. 1. Where the lungs and blood exchange oxygen and carbon dioxide
  2. 3. Passageway for air
  3. 5. disease of the respiratory system
  4. 6. The name of this system
  5. 8. What the main function is