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https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14012355

Blood circulation in the respiratory system, showing the pulmonary artery and vein. Ink and white paint on paper, with acetate overlay, by D. Vaihinger, 1975.

Original public domain image from Wellcome Collection

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Blood circulation in the respiratory system, showing the pulmonary artery and vein. Ink and white paint on paper, with acetate overlay, by D. Vaihinger, 1975.

More