circulating blood is rather viscous substance that varies from bright scarlet to dull brick red, depending on the amount of oxygen it is carrying. hope that helps. CC Circulating blood is rather viscous substance that varies from bright scarlet to a dull brick red, depending on the amount on oxygen it is carrying. Hope that helps. CC
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oxygenated blood, or arterial blood, is bright red. deoxygenated blood, or venous blood, is dark red.