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Bile acids are steroid acids found predominantly in the bile of mammals and other vertebrates. Diverse bile acids are synthesized in the liver. [1] Bile acids are conjugated with taurine or glycine residues to give anions called bile salts. [2] [3] [4] Primary bile acids are those synthesized by the liver.
In the human liver, bile is composed of 97–98% water, 0.7% bile salts, 0.2% bilirubin, 0.51% fats (cholesterol, fatty acids, and lecithin), and 200 meq/L inorganic salts. [ 2 ] [ 3 ] The two main pigments of bile are bilirubin , which is orange-yellow, and its oxidised form biliverdin , which is green.
In humans, primary bile acids are synthesized from cholesterol in the liver to form either cholic acid (CA) or chenodeoxycholic acid [clarification needed] (CDCA). [7] These primary bile acids are then conjugated to the amino acids glycine or taurine and stored in the gallbladder. [7]
The bile salt component is an active non-enzymatic substance that facilitates fat absorption by helping it to form an emulsion with water due to its amphoteric nature. These salts are formed in the hepatocytes from bile acids combined with an amino acid. Other compounds such as the waste products of drug degradation are also present in the bile ...
In the lower small intestine and colon, bacteria dehydroxylate some of the primary bile salts to form secondary conjugated bile salts (which are still water-soluble). Along the proximal and distal ileum, these conjugated primary bile salts are reabsorbed actively into hepatic portal circulation. Bacteria deconjugate some of the primary and ...
Bile consists of water, electrolytes, bile acids, cholesterol, phospholipids and conjugated bilirubin. [2] Some components are synthesized by hepatocytes (liver cells); the rest are extracted from the blood by the liver. [3] Bile is secreted by the liver into small ducts that join to form the common hepatic duct. [4]
Bile salts: Bile salts are secreted from liver and they facilitate lipid digestion in the small intestine. [27] Eicosanoids: Eicosanoids are made from fatty acids in the body and they are used for cell signaling. [28] Ketone bodies: Ketone bodies are made from fatty acids in the liver. Their function is to produce energy during periods of ...
Bile produced by the liver is made up of water (97%), bile salts, mucus and pigments, 1% fats and inorganic salts. [25] Bilirubin is its major pigment. Bile acts partly as a surfactant which lowers the surface tension between either two liquids or a solid and a liquid and helps to emulsify the fats in the chyme.