What is the purpose of the biliary ducts?

The biliary ducts serve the essential function of conveying bile from the liver to the gallbladder and then into the small intestine. Bile is a digestive fluid produced by the liver that aids in the emulsification and absorption of fats as well as the elimination of certain waste products from metabolism. This process is crucial for digestion and nutrient absorption in the gastrointestinal tract.

In contrast, the other choices relate to different bodily functions. The transport of blood to the liver is primarily managed by the hepatic portal vein and hepatic arteries, while nutrient absorption occurs mainly in the small intestine through the intestinal villi and microvilli. The filtering of waste from blood is primarily handled by the kidneys, which regulate blood composition and remove waste products through urine. Therefore, the primary purpose of the biliary ducts is correctly identified as the conveyance of bile.