Human blood appears red because hemoglobin, a protein in red blood cells containing iron, binds oxygen and changes how light is absorbed and reflected, with oxygen-rich blood reflecting more red wavelengths and appearing bright red, while oxygen-poor blood appears darker.
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Why Is Human Blood Red? The Science Explained 🩸Ajouté :
Why is blood red? It comes down to a single molecule, hemoglobin.
Inside your red blood cells, hemoglobin binds oxygen.
At its core is iron. When oxygen attaches to iron, it changes how light is absorbed and reflected. More red wavelengths are reflected back. That's why oxygen-rich blood appears bright red. When oxygen is low, the color becomes darker.
So, blood isn't just red by chance. It's the chemistry of iron interacting with oxygen inside every cell.
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