Across
- 5. Two tubes that divide and enter the lungs.
- 6. Small tubes in the lungs that go to the alveoli.
- 7. Interconnecting bones that help you stand upright.
- 9. Thin lining around the lung.
- 11. Front chest bone.
- 12. Are tiny air sacs.
Down
- 1. These exchange blood oxygen and carbon dioxide.
- 2. Muscle below the lungs that contracts and expands.
- 3. Another word for windpipe.
- 4. The body system that takes in oxygen and releases carbon dioxide.
- 8. Are elastic sponge like organs.
- 10. Top of the treachea.