Why do we have blood cells red in color?
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RBC contain Hemoglobin which has Heme. Heme contains 4 porphyrin rings. which is attached to iron(Fe+2). When oxygen binds to it, the Iron gets Oxidized and hence we see blood as red. read more
Within the red blood cells there is a protein called hemoglobin. Each hemoglobin protein is made up subunits called hemes, which are what give blood its red color. More specifically, the hemes can bind iron molecules, and these iron molecules bind oxygen. The blood cells are red because of the interaction between iron and oxygen. read more
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