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Across 1. branch leading to the right side of the lung 6. the volume of gas remaining in the lungs after maximum expiration 8. allows the blood to hold oxygen 12. microscopic bloob vessels that allow gas exchange 14. musculat tube that connects the mouth to the rest of the digestive tract 15. the side of the lung with two lobes

Down 2. a dangerous gas that stops the blood from holding oxygen 3. the side of the lung with three lobes 4. even smaller branches of bronchi 5. branch leading to the left side of the lung 7. membranous sacs which surround the lungs 9. also know as the "voice box" 10. prevents food from entering the windpipe 11. key part of external respiration 13. also know as the windpipe