Light micrograph showing a collapsed lung. This is the parenchyma when the lung is fixed after opening of the chest, losing the negative pressure which maintains the lung's expansion.

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Photo credit: © JOSE CALVO / SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: -, abnormal, alveoli, alveolus, collapsed, light, lm, lung, medical, medicine, micrograph, microscopy, pathohistological, pathohistology, postmortem, pulmonary, respiratory, unhealthy