Respiratory System

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Across
  1. 5. Branching air passages inside the lungs
  2. 6. Leading cause of cancer death for both men and women
  3. 8. Air flow out of the lungs
  4. 9. Microscopic air sac of the lungs
  5. 10. Air flow into the lungs
  6. 12. Process that supplies the body with oxygen and rids carbon dioxide
Down
  1. 1. Secretion that reduced surface tension of water molecules; prevents collapse of alveoli
  2. 2. The windpipe
  3. 3. An increase in the rate and depth of breathing that exceeds the body's need to remove CO2
  4. 4. Occupy thoracic cavity
  5. 7. Breathing cessation
  6. 11. Air that remains in the lungs that does not contribute to gas exchange