What does the "enterohepatic circulation" refer to?
A. The superior mesenteric-portal venous circuitBile acids act as detergents which increase the solubility oflipid micelles which are taken up by the brush border membrane of the jejunum, where over 90% of fat is absorbed. The bile acids themselves remain in the intestinal lumen and are reabsorbed in the distal ileum where they enter the portal venous circulation and are re-secreted in the bile.