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Keywords: This blood has just been removed from a systemic vein in the arm. It is dark red in colour, clearly darker than an arterial sample. The dark red colour is generated by the higher proportion of deoxyhaemoglobin in venous blood. This blood has just been removed from a systemic vein in the arm. It is dark red in colour, clearly darker than an arterial sample. The dark red colour is generated by the higher proportion of deoxyhaemoglobin in venous blood. |