Which statement about the transport of indirect bilirubin in the bloodstream is most accurate?

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!

Indirect (unconjugated) bilirubin is hydrophobic and cannot ride freely in the aqueous plasma. To travel safely through the bloodstream, it binds tightly to albumin, which acts as a carrier delivering it to the liver for uptake by hepatocytes where it is conjugated to become water-soluble. This albumin-bound transport keeps bilirubin from crossing membranes into tissues and causing toxicity, and it explains why the kidneys don’t play a primary role in its excretion in this form. Only after conjugation in the liver does bilirubin become soluble enough to be excreted into bile.