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The hemoglobin in the blood goes red when it absorbs oxygen. Blood is not always red, if it is lacking in oxygen, it is infact blue. If you look at the veins in your arm or hand, they do not have much blood and therefore will be blue.

You will never see blue blood because if you cut yourself, the blood is exposed to the air, allowing it to be oxygenated and thus turning it red.

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13y ago

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