hugeasstool: These are samples of oxygenated [right] and deoxygenated [left] blood. Both of these colours of blood will exist in your body at any point. It’s often thought, because veins appear blue or green through skin, that deoxygenated blood is

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hugeasstool: These are samples of oxygenated [right] and deoxygenated [left] blood. Both of these colours of blood will exist in your body at any point. It’s often thought, because veins appear blue or green through skin, that deoxygenated blood is

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