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The lungs. The bronchioles are the first airway branches that no longer contain cartilage. They are branches of the bronchi, and are smaller than one millimeter. http://en.wikipedia.org/wiki/Bronchiole The lungs are in the respiratory system. They are used in the processing of oxygen in the body. The bronchioles are the first airway branches that no longer contain cartilage. They are branches of the bronchi, and are smaller than one millimeter.

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17y ago

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