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Myth #2: Deoxygenated blood is blue in color

Blood that lacks oxygen, which is pumped through the veins toward the heart, is definitely not blue — it’s a dark red color. In school textbooks it’s colored blue to emphasize the contrast with oxygenated blood. The veins you can see through your skin seem blue because the light shining on them gets refracted.

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11 Common Myths About The Human Body That Lots Of People Believe Are True
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