COPD is a chronic lung disease with severe narrowing of the airways. Even administering medication cannot fully cure this narrowing. The model impressively shows the changes to the bronchial tissue (from bottom to top):
normal condition
abnormal mucous secretion, thickening of the bronchial mucosa
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Returns
To return this item you must contact Customer Service within 14 days of receipt to obtain a valid Return Authorization Number. Restocking fees may apply at the discretion of the manufacturer.