Across
- 5. the blood vessels that surround each alveolus
- 7. a band of muscle at the bottom of the thorax
- 8. the muscles that move the rib cage
- 10. The action of moving air in and out of the lungs
- 11. a property of the walls of the alveoli that allows gases to dissolve
- 12. the gas we want to get into the blood stream
Down
- 1. Small air sacs
- 2. One of a pair of tubes in the lungs
- 3. Also known as the windpipe
- 4. the smallest air pathways in the lungs
- 6. Rings of this hold the trachea open
- 9. the gas we want to remove from the blood stream