Which organ is primarily responsible for processing bilirubin produced from red blood cell breakdown?

Which organ is primarily responsible for processing bilirubin produced from red blood cell breakdown?

• A. Spleen
• B. Liver
• C. Intestines
• D. Kidneys

Answer: (B)

Bilirubin processing is centered in the liver. After heme from broken red blood cells is converted to bilirubin in macrophages, this unconjugated bilirubin travels in the blood bound to albumin to the liver. Hepatocytes take it up and conjugate it with glucuronic acid, forming conjugated bilirubin, which is water-soluble and excreted into bile. From there it goes into the intestine, where gut bacteria modify it further and it eventually becomes part of stool or is reabsorbed and excreted in urine in trace amounts. The liver’s role in conjugating and excreting bilirubin is what makes it the primary organ for this process.