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Why is blood blue inside you?

Updated: 8/20/2019
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Wiki User

12y ago

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It is not blue inside you. It is dark red or vivid red, depending on oxygenation level.

The confusion may arise from the fact that veins (which contain blood) look like they are blue. These veins are actually also red, but appear blue because the hypodermisabsorbs low-frequency light, permitting only the highly energetic blue wavelengths to penetrate through to the dark vein and reflect off.

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12y ago
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Q: Why is blood blue inside you?
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When blood is inside of you is it blue?

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Is your blood blue inside your body?

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