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chronic obstructive pulmonary disease is a chronic bronchiolitis that involves airway constriction and expiratory effort. It involves:
- hyperplasia and hypertrophy of bronchiolar epithelium
- goblet cell metaplasia and increased airway secretions
- excessive mucus retention in airways
- another allergic phenomenon is
extrinsic allergic alveolitis; it is uncommon in animals.
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