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