How much of bilirubin is oxidized into stercobilin and urobilin?

Bilirubin is a breakdown product of hemoglobin and plays a crucial role in the body's process of excreting waste. After bilirubin is produced, it undergoes a series of transformations in the liver and the intestines. The majority of bilirubin is eventually converted to stercobilin and urobilin through oxidation processes.

The correct answer, which states that 98% of bilirubin is oxidized into stercobilin and urobilin, reflects the efficiency of bilirubin metabolism within the human body. When bilirubin is converted in the intestines, it transforms into stercobilin, which gives feces their characteristic brown color, and urobilin, which is excreted in urine and contributes to its yellow color.

This high conversion rate indicates a well-functioning metabolic process, ensuring that the body efficiently deals with bilirubin and preventing its accumulation, which could lead to conditions such as jaundice.