The Respiratory System

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Across
  1. 4. Tubes that lead to the lungs
  2. 5. Where oxygen from the air is transferred to the blood
  3. 8. A muscle under the lungs to help them inhale
  4. 9. Breathe OUT
Down
  1. 1. Windpipe
  2. 2. Gas we breathe OUT
  3. 3. Sticky substance in the nose that traps particles
  4. 6. Breathe IN
  5. 7. Gas we breathe IN