Respiratory System

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Across
  1. 6. the ______ connects the nasal cavity and mouth to the larynx
  2. 7. the _____ zone is where gas exchange occurs
  3. 8. the _____ zone is where air is humidified and filtered
  4. 10. the second phase of breathing when air leaves the lungs
  5. 11. the membranes that surround the lungs
Down
  1. 1. the gas that we breathe in that our cells need for cellular respiration
  2. 2. the muscle that moves the lungs
  3. 3. the first phase of breathing, when air enters the lungs
  4. 4. the gas that we breathe out that is a byproduct of cellular respiration
  5. 5. the tiny thin-walled air sacs where the bulk of gas exchange occurs
  6. 9. the diaphragm contracts whenever we (inhale or exhale?)
  7. 10. the diaphragm relaxes/releases it's contraction whenever we (inhale or exhale?)