https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14012355Edit ImageSaveSaveEditCropCustom TextBlood 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 CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 846 x 1200 px | 300 dpiLarge JPEG 2238 x 3174 px | 300 dpiFree DownloadBlood 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