Breakdown of Unconjugated bilirubin haemoglobin bound to albumin and other haem proteins Unconjugated bilirubin (未结合胆红素) Transport, Uptake Conjugation (glucuronyl transferase) Conjugate Conjugated bilirubin Conjugated bilirubin (结合胆红素) Excretion in bile Excretion Enterohepatic Stercobilinogen circulatiUnconjugated bilirubin (未结合胆红素) Transport, Uptake Conjugate Conjugated bilirubin (结合胆红素) Excretion