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Colored anatomical plate showing lung alveoli: a cluster, a healthy cross section, and a diseased air sac with blood vessels.

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Lungenbläschen, Karl Ludwig Alfred Fiedler (1912). Via artnap.com

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Why is this public domain? Karl Ludwig Alfred Fiedler died in 1921; this work is in the public domain.

About this work

This anatomical chart, titled Lungenbläschen, shows lung alveoli in three views: a cluster of air sacs attached to a bronchial tube, a cross section of a healthy alveolus with its capillary network and lining cells, and a diseased alveolus. Red and blue tones distinguish arteries and veins, and the captions give magnification levels. The work is attributed to Karl Ludwig Alfred Fiedler and dated 1912.