Question: Down 1 . where cellular respiration takes place 4 . keeps alveoli from collapsing 5 . illness caused by smoking 8 . test that measures

Down
1. where cellular respiration takes place
4. keeps alveoli from collapsing
5. illness caused by smoking
8. test that measures air volume
9. required for cellular respiration
11. inflammation of air passages
15. prevents food entering airway
17. cavity where lungs sit
18. muscle used for breathing
19. fluid build-up in air sacs, caused by altitude sickness

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