Emphysema is a chronic lung disease that is caused by damage to the alveoli, the tiny air sacs in the lungs where
the exchandamage in emphysemage of oxygen and carbon dioxide takes place. The air becomes trapped into the alveoli due to alveoli damage, causing more damage by expanding and rupture in alveoli. 

Emphysema is part of the Chronic Obstructive Pulmonary Disease (COPD) umbrella, together with chronic bronchitis and bronchiectasis.

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