The Respiratory System

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Across
  1. 2. Muscle that helps you breathe in and out.
  2. 5. Tiny tubes after the big branches.
  3. 6. The air tube in your throat.
  4. 9. Where air goes in first
  5. 10. Super small blood paths near the air bubbles
  6. 11. something that your body switches with CO2
Down
  1. 1. Gas swapping spots.
  2. 3. Where air goes and gases are swapped.
  3. 4. Little air bubbles where the swap happens
  4. 5. Big branches that split into the lungs.
  5. 7. Bones that guard your lungs and heart
  6. 8. dioxide