Respiratory system

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Across
  1. 2. another name for windpipe.
  2. 4. pink balloon-likee structure located in the chest cavity.
  3. 5. the trachea divides into two parts called ______
  4. 6. Air enters through this part.
Down
  1. 1. the muscular sheet that separates the chest cavity from the abdominal cavity.
  2. 3. site of gas exchange.