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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.
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https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14003112

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.

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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.

Original public domain image from Wellcome Collection

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Public DomainFree CC0 image for Personal and Business use

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