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Veins Bluish Blood Is  Deoxygenated High  Levels

Veins appear bluish because their blood is deoxygenated with high CO2 levels.

Le vene appaiono bluastre perché il loro sangue è deossigenato con alti livelli di CO2.

Front why do veins appear bluish?
Back their blood is deoxygenated with high CO2 levels

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