The Respiratory System

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Across
  1. 2. responsible for letting air enter the body,then warming and filtering it
  2. 6. total volume of air that can be exhaled after maximum inhalation
  3. 8. houses the lungs and heart
  4. 9. contracts and relaxes to help the lungs move
Down
  1. 1. thin-walled air sacks in the lungs where gas exchange occurs
  2. 3. voicebox
  3. 4. instrument used for measuring air entering and leaving the lungs
  4. 5. muscles located between the ribs
  5. 7. bring air from trachea to lungs and branch into bronchioles