Why Do Your Veins Look Blue If Your Blood Is Red? 🔵

Why Do Your Veins Look Blue If Your Blood Is Red? 🔵

Why do your veins look blue when human blood is actually red? 🤯

The answer isn't blue blood.

Human blood remains red, but veins can appear blue through the skin because of the complex way light interacts with skin, tissue, and blood. Different wavelengths penetrate and are absorbed or scattered differently, and your visual system interprets the resulting contrast as a bluish appearance.

In this Body Spectra 3D medical animation, we go beneath the skin to visualize what is really happening to light as it travels toward the blood vessels—and why your eyes can make a red vessel look blue.

Discover fascinating human anatomy, physiology, biology, neuroscience, physics, and everyday body mysteries through cinematic 3D visualization.

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This video is for educational purposes only.

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