Your Veins Are NOT Blue — Here’s Why

Your blood color is not what you were taught in school. We are cutting through the biological myths to see why veins look blue. Most people believe that deoxygenated blood turns blue inside the body, but this is a simple optical illusion. By looking at how light interacts with skin and the physics of blood color, we can strip away the misconception that our veins are actually blue. It comes down to how your eyes process light reflecting off your skin, not the pigment inside your vessels. We examine the biology of oxygenated blood and how vasodilation changes the appearance of your circulatory system. When you actually see blood outside the body, it is always red, regardless of where it came from. This breakdown explains the science of why your eyes lie to you every time you look at your wrist, and how the interaction of light and skin creates a false image of your internal anatomy. Subscribe for weekly science breakdowns, and let me know in the comments if you want to see the biology of human vision next. 0:00 The Mystery of the Blue Wrist Line 2:21 Why Veins Look Blue Under Your Skin 4:32 When Blood Actually Turns Blue 5:51 Why We Can See Our Veins #bloodfacts #humananatomy #science