Emphysema
Emphysema is a lung diseases which a type of COPD (chronic obstructive pulmonary disease).
Normally, air sacs on lungs are elastic. But, emphysema makes damaged on wall between air sacs then air sacs loose their shape and become floppy.
One of the causes of emphysema is due to long-term exposure irritant, such as cigarrette smoke.
Learn more about lung diseases here : https://brainly.com/question/14983461
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