Which statement about bilirubin is true?

Study liver anatomy and function with our medical students test. Engage with detailed multiple choice questions, each with hints and explanations. Prepare effectively for your test!

Bilirubin metabolism hinges on the transformation from an unconjugated, fat-soluble form to a water-soluble conjugated form in the liver. Heme breakdown first yields unconjugated (indirect) bilirubin, which is carried in the blood bound to albumin to the liver. In hepatocytes, it is conjugated with glucuronic acid by the enzyme UDP-glucuronyl transferase, producing direct (conjugated) bilirubin that is water-soluble and ready for excretion in bile. Therefore, the statement that direct bilirubin is produced in the liver by conjugating indirect bilirubin is correct. The other statements are not accurate: direct bilirubin is not the unconjugated form; indirect bilirubin is not water-soluble; and indirect bilirubin is not produced by conjugation in the liver.