When a red blood cell is recycled, its iron can be reused by the body but its bilirubin is processed in the liver as a waste product.
The red-orange chemical bilirubin (BR), sometimes known as "red bile," is produced by the usual catabolic process used by vertebrates to break down heme. The body needs to go through this catabolism in order to get rid of waste products that result from the oxidation of old or dysfunctional red blood cells.
The heme molecule is separated from the hemoglobin molecule in the initial phase of the bilirubin production process. The steps of porphyrin catabolism that heme goes through next vary depending on the part of the body where the breakdown takes place.
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