The Respiratory System

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Across
  1. 2. (Inflates and deflates the lungs)
  2. 4. (What we exhale)
  3. 7. (Tube that connects bronchus to alveoli)
  4. 8. (A pipe from Nose to Bronchus)
  5. 10. (The entrance of oxygen)
  6. 11. (Are blood vessels in alveoli walls)
Down
  1. 1. (movement of oxygen and blood)
  2. 3. (Two big air bags)
  3. 5. (What we inhale)
  4. 6. (Air sacs that exchange oxygen)
  5. 7. (A pipe that splits air)
  6. 9. (A protective shield for some organs)