CIULLA_LIVER FUNCTION & PORPHYRIN FORMATION
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Principal pigment in bile that is derived from hemoglobin breakdown
Bilirubin
From what system is bilirubin produced
reticuloendothelial system
Bilirubin is produced from the breakdown of ____.
hemoglobin from senescent red blood cells (RBCs)
Prior to transport to the liver, bilirubin forms a complex with _______.
albumin
Upon forming a complex with albumin, bilirubin is (conjugated/unconjugated) and (is/not) water-soluble.
unconjugated, not water soluble
Where is bilirubin conjugated
hepatocyte endothelial system
Product of conjugation of bilirubin and glucuronic acid
bilirubin diglucuronide (conjugated bilirubin)
Reaction of bilirubin and glucuronic acid is catalyzed by ________.
uridine diphosphate (UDP) glucuronyltransferase
T/F: Conjugated bilirubin is water-soluble.
TRUE
Conjugated bilirubin is excreted into what form prior to storage in the gallbladder?
bile
Conjugated bilirubin is stored in the ______.
gallbladder
Pathways of urobilinogen
Intestinal urobilinogen: reabsorbed Portion returns to the liver Some enters the circulation for excretion in the urine
Once conjugated bilirubin is excreted into bile, and secreted into the duodenum in response to gallbladder stimulation, it is further reduced by anaerobic bacteria in the intestine to _______.
urobilinogen
Some bilirubin is oxidized by anaerobic bacteria for excretion in the stool in the form of ______.
urobilin
an orange-brown pigment that gives stool its characteristic color.
urobilin
a yellow discoloration that occurs when the bilirubin concentration in the blood rises and the bilirubin is deposited in the skin and sclera of the eyes.
jaundice
what concentration of bilirubin will jaundice be considered?
> 2-3 mg/dL
Elevated bilirubin deposits in brain tissue of infants, affecting the central nervous system and resulting in mental retardation.
kernicterus
Bile is secreted by _____.
liver
Bile is stored in the _______.
gallbladder
Composition of bile salts
cholic acid chenodeoxycholic acid conjugated with glycine or taurine
the primary site in the body for synthesis of waste products
liver
the primary site in the body for d conversion of drugs to metabolites for excretion in urine or stool
liver
type of jaundice which occurs when there is excessive erythrocyte destruction, as seen in hemolytic anemias, spherocytosis, toxic conditions, hemolytic disease of the newborn caused by Rh or ABO incompatibility
Pre-hepatic jaundice