https://tube.blueben.net/videos/watch/3d89b0f2-b19e-4894-bbbe-b76a0b497640 Why Do Veins Look Blue? Arterial blood is bright red because it carries oxygen from the lungs. After releasing oxygen, venous blood becomes dark maroon—never blue. Veins only look blue or green beneath the skin because red light penetrates deeper, while blue and green wavelengths are reflected back to your eyes. Mon, 24 Aug 2026 05:54:00 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://tube.blueben.net https://tube.blueben.net/client/assets/images/icons/icon-96x96.png https://tube.blueben.net/videos/watch/3d89b0f2-b19e-4894-bbbe-b76a0b497640 All rights reserved, unless otherwise specified in the terms specified at https://tube.blueben.net/about and potential licenses granted by each content's rightholder.