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Asthma. (a) A normal bronchiole. (b) An asthmatic bronchiole. During an asthma “attack,” the bronchi

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Asthma. (a) A normal bronchiole. (b) An asthmatic bronchiole. During an asthma “attack,” the bronchioles constrict to reduce the airway. In addition, the mucous membrane lining the bronchioles swells, and thickened mucous secretions form plugs that further reduce the airway.
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