How much bile is excreted as stool and how much re-enters the liver through the enterohepatic circulation? From most sources, it says that most (80%) re-enters the liver, but according to First Aid, they have it the other way around where 80% is excreted and 20% enters the liver, with some entering urine.
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Step I Bile Excretion
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As far as I'm aware, 80% of bilirubin is excreted as stercobilin, with 18% returning to the liver and 2% making the urine as urobilin (90 and 10%, respectively, of the 20% that is reabsorbed).
However, 90-95% of bile acids are reabsorbed via the terminal ileal Na+/bile acid symporter.
Remember that clear distinction.
Random fact encountered in a practice question:
Vitamin B2 is given to neonates with physiologic jaundice alongside their phototherapy because it is sensitive to photo-degradation. The excess unconjugated bilribuin is converted to lumirubin, which is water-soluble.
However, 90-95% of bile acids are reabsorbed via the terminal ileal Na+/bile acid symporter.
Remember that clear distinction.
Random fact encountered in a practice question:
Vitamin B2 is given to neonates with physiologic jaundice alongside their phototherapy because it is sensitive to photo-degradation. The excess unconjugated bilribuin is converted to lumirubin, which is water-soluble.
