Respiratory System

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Across
  1. 2. muscle at the base of the lungs that contracts and relaxes when breathing
  2. 4. cavity the place where the lungs are enclosed
  3. 6. correct word for the branches in the lungs
  4. 7. air sacs in the lungs
  5. 9. air movement from the atmosphere into the lungs; breathing in
Down
  1. 1. air movement from the lungs to the atmosphere; breathing out
  2. 3. delivers air into the lungs
  3. 5. the gas we exhale out of our body into the atmosphere
  4. 8. 2 bag like organs, situated in each side of the heart
  5. 10. artery correct word for a blood vessel within the lungs
  6. 11. another word for windpipe
  7. 12. the gas we inhale into our body in order to breathe