Final answer:
The common bile duct is formed by the convergence of the common hepatic duct and the cystic duct, through which bile is transported to the small intestine.
Step-by-step explanation:
The convergence of the common hepatic duct and the cystic duct forms the common bile duct. The common hepatic duct is a fusion of the right and left hepatic ducts that exit the liver, while the cystic duct connects to the gallbladder. This common bile duct is responsible for carrying bile into the small intestine, facilitating the digestion of fats. It is worth mentioning that the main pancreatic duct also joins the common bile duct through the hepatopancreatic ampulla before it enters the duodenum, enabling the flow of pancreatic juices that help in digestion as well.