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Across 2. What muscle extends along the bottom of the ribs to help with respiration. 5. What cells do not need oxygen to live? 7. What reduces the surface tension of the lungs by coating the inside surface? 8. What do capillaries remove from the blood? 9. The vocal cords are found within what organ? 11. The physical process of breathing and gas exchange is called _______ respiration. 12. If there is tension on the vocal cords is the pitch higher or lower?

Down 1. What passageway does air go through that leads into the alveoli? 3. Of or relating to the lungs. 4. If we don't have bones supporting out trachea, what is supporting it? 6. What do our brain cells need to survive. 10. The nasal cavity filters air by the ____ in the nose.