Respiratory system

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Across
  1. 1. Windpipe
  2. 3. Thin walled sacs of lung tissue.
  3. 5. Folds of connective tissue.
  4. 7. Another word for throat
Down
  1. 2. A tiny hairlike extension that move together in a sweeping motion
  2. 4. Voice box
  3. 6. Main organ of the respiratory system