Since venous blood is oxygen-poor blood, it is not as bright red as arterial blood. It appears as a deep, dark-red, almost purplish color. Seeing "blue blood" in veins through the skin is a combination of light passing through the skin and the oxygen-poor blood.
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Why does blood in the veins look blue?
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 | Why do some veins look blue and others look red? Read answer... |
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 | Is the blood in your veins really blue and purple or does it just look that way? |
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