How COPD Affects Breathing. When your lungs are healthy and work properly, the air you breathe moves freely in and out. Inside your lungs are airways, which are called bronchial (BRONK-ee-ol) tubes. The airways branch into clusters of air sacs called alveoli (AL-vee-OL-ee). When you breathe in fresh air, it moves into the air sacs, where oxygen is absorbed into the blood stream and carried to all parts of your body. The air sacs also remove carbon dioxide from the blood. When you breathe out, stale air with carbon dioxide passes out of your airways and lungs.
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