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| Description: Emphysema. (a) Illustration comparing normal lungs and emphysemic lungs. The inserts illustrate how alveolar walls deteriorate in emphysema, reducing their surface area by convergence. (b) Common appearance of a patient with emphysema. Characteristic signs include reduced weight, a barrel chest, and a drawn facial appearance, all due to the need to inhale deeply and forcibly exhale with nearly every breath.
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