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Breathing system. The parts. The parts continued. Parts and roles. Associated parts and roles. Breathing. http://video.about.com/asthma/How-Lungs-Function.htm. Breathing activity. Breathing in (inspiration/inhalation). Breathing out (expiration/exhalation). Efficiency features of lungs.
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Breathing • http://video.about.com/asthma/How-Lungs-Function.htm
The lungs can clean themselves • http://www.youtube.com/watch?v=HiT621PrrO0&feature=related • http://www.youtube.com/watch?v=miEEluVlemQ • (both videos cover similar subject matter, i.e. how the lungs clean themselves). It is worth looking at both.