Respiratory System

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Across
  1. 4. This a hollow tube that goes down the neck and ends at the top of the trachea
  2. 5. This is divided into two tubes
  3. 6. This lies above the mouth and moves air through these passages during breathing
  4. 7. Are the large air passages that lead from the trachea (windpipe) to the lungs
  5. 8. The opening
  6. 9. A pair of air-filled organs located on either side of the chest
Down
  1. 1. This is the muscle that causes the chest to contract and relax
  2. 2. Tiny air sacs where the blood exchange occurs
  3. 3. Inside the lungs these tubes arrive into smaller and smaller tubes