The protein hemoglobin stores iron in the blood. When it becomes oxidized it produces a red color. This is much the same as the oxidation of iron rust.
Your red blood cells contain iron-rich protein molecules called hemoglobin. When hemoglobin picks up oxygen, either from your lungs or from the air when you get a cut, your blood turns a bright red color. As bialowieza stated earlier, this process is remeniscient of the rusting process that iron goes through.
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