Respiratory System

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Across
  1. 2. The throat; a passage for air in the R.S.
  2. 4. The windpipe; a passage for air in the R.S.
  3. 5. The voice box
Down
  1. 1. The passages that direct air into the lungs.
  2. 3. Tiny sacs of lung tissue that move gas between air and blood.