The metabolic wastes of the RBCs are released as bile pigments by the liver. The bile pigments are:
Liver produces bile pigments (bilirubin, biliverdin and urochrome) which are metabolic wastes of haemoglobin of dead R.B.C.Urochrome is eliminated through urine. Biliverdin and Bilirubin are excreted through bile along with cholesterol and derivatives of steroid hormones, extra drug vitamins and alkaline salts.