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Blood that contains hemoglobin (such as in humans and other vertebrates) is always red. The reason veins appear to be blue is due to the lack of oxygen. If you hold your hand up to a light source, your hand will glow red because of the blood being red.

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13y ago

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What color is your blood with no oxygen?

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Are red blood cells always red?

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Why is always blood red?

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How do you know that the blood in the arteries is oxygen-rich?

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Is blood really blue?

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