Final answer:
If enterohepatic cycling does not occur, excretion can occur through the liver via bile, feces, and urine. Bile is produced by the liver and is responsible for emulsifying fats. Some substances, like bilirubin, are converted into water-soluble forms in the liver and excreted via bile into the intestine.
Step-by-step explanation:
If enterohepatic cycling does not occur, excretion can occur through the liver via bile, feces, and urine. Bile is produced by the liver and is responsible for emulsifying fats. It is excreted directly into the duodenum or stored in the gallbladder. The remaining bile is eventually eliminated through feces. Some substances, like bilirubin, are converted into water-soluble forms in the liver and excreted via bile into the intestine. In the intestine, bilirubin is further converted into stercobilinogen and then stercobilin, which gives feces its brown color. A small fraction of bilirubin is reabsorbed and excreted in urine as urobilin.