BILIARY PIGMENT Meaning and
Definition
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Biliary pigment refers to a group of pigments that are formed as a result of the breakdown of hemoglobin in the liver and are secreted into the bile. These pigments are responsible for the characteristic color of bile and are also known as bilirubin and biliverdin.
Bilirubin is the main biliary pigment and is a yellow-orange pigment that is derived from the breakdown of heme, a component of hemoglobin found in red blood cells. It is formed when red blood cells reach the end of their lifespan and are broken down in the liver. Bilirubin is then processed by the liver and excreted into the bile. In the intestines, bilirubin is further metabolized into urobilinogen, which gives stool its brown color.
Biliverdin is another biliary pigment that is formed during the breakdown of heme. It is a green pigment and is produced in small amounts compared to bilirubin.
The production and excretion of biliary pigments play a crucial role in the body's waste disposal system. Any disruption in the normal metabolism or excretion of biliary pigments can cause a buildup of bilirubin, leading to jaundice, which is characterized by a yellow discoloration of the skin and eyes.
Overall, biliary pigments are important components of bile and play a vital role in the metabolism and elimination of waste products in the body.
