Across
- 3. It is a tube that transports air to the lungs. It is also called a wind pipe.
- 4. branches from the trachea into each lung.
- 5. The main organ of the Respiratory system which takes in oxygen and releases carbon dioxide.
Down
- 1. Cleans the air that we breathe.
- 2. A muscle that contracts and relaxes to bring the air in and out of the lungs.