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The amount of ________________ wastes in the blood determine how fast you breathe. You breathe faster to take in the extra _____________ that is needed.
warmed, filtered, moistened
Cold air is _______________ in the nasal passages, ________________ by the hairs and mucus in the linings, and ___________________ by the mucus on the way to the lungs.
Air sacs in the lungs are called the ________________. Tiny blood vessels, or __________________, take oxygen from the air sacs into the blood stream.
cigarette smoke, coal dust, pollution
It's a well-documented fact that continuous exposure to ___________________ over a long period of time, damages the lungs
Plants give off O2 which humans inhale. Plants take in the CO2 that humans exhale.
Why do humans and plants have a good "working relationship"
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