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CGP EDU Academic Team
Published on: August 21, 2026
Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of:
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Volume of air present in lungs after forceful expiration as residual volume prevents the collapsing of alveoli.
Atelectasis is a complete or partial collapse of the entire lung or area (lobe) of the lung. It occurs when the tiny air sacs (alveoli) within the lung become deflated or possibly filled with alveolar fluid. Atelectasis is one of the most common breathing (respiratory) complications after surgery.
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