Gas Exchange

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Across
  1. 1. where air enters first
  2. 3. thin walled and surrounded by capillaries
  3. 4. throat
  4. 6. in breathing
  5. 7. upside down tree
  6. 8. lines respiratory system with mucous
Down
  1. 2. exchange of gases between blood and alveolar air
  2. 5. voice box