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Across 1. two branches off the trachea that go to each lung 6. exchange of gases in the lungs 9. tubes that branch off the bronchi in the lungs 10. inflammation on the lungs from bacteria or virus 11. windpipe 12. air sacs in the lungs where respiration takes place 13. condition where alveoli lose their elasticity, usually fatal

Down 2. exchange of gases at the cells 3. traps particles in the nasal passages 4. the throat 5. voice box 7. tiny hairs that line respiratory system 8. inflammation of the bronchi