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Slightly. Blood is always red (common misconception is that it is blue). But when blood binds to oxygen it gets slightly darker red. It is always red because of the porphyrin in the heme group. The heme group in hemoglobin (the protein responsible for transporting gases in the red blood cells) consists of a porphyrin and an Iron ion. Another misconception is that the Iron causes the blood to be red, but it is the organic molecule Porphyrin that does this.

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15y ago

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