The Respiratory System

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Across
  1. 3. How much of something there is(gasses)
  2. 5. Air sacs where gas exchange occurs
  3. 6. The structures that branch into the lungs
  4. 8. The gas that is removed by the lungs
  5. 9. The hollow organ in the respiratory system
Down
  1. 1. Substance that breaks water tension in alveoli
  2. 2. The process where air is taken into the lungs
  3. 4. The large muscle that controls respiration
  4. 7. The vital gas for life