The Respiratory System

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