Which of the digestive organ below is NOT part of the digestive tract proper?[Fill in the blank]

Question

BlackTom AI · Accepted Answer

The question asks which digestive organ listed is NOT part of the digestive tract proper.
Option a) Esophagus: This is a major component of the digestive tract, serving as the conduit from the pharynx to the stomach, so it is part of the tract.
Option b) Biliary duct: These ducts (such as the common bile duct) belong to the biliary system, which transports bile from the liver and gallbladder but is not part of the alimentary canal itself; they connect to the digestive system but are not within the tract proper, so this is the correct choice here.
Option c) Oropharynx: This region is the junction between the mouth and the pharynx and is considered part of the digestive tract pathway, not outside it.
Option d) Sigmoid colon: The sigmoid colon is a section of the large intestine within the digestive tract, involved in water absorption and feces formation, so it is part of the tract.
Option e) Caecum: The caecum is the beginning section of the large intestine and a direct component of the digestive tract, thus part of the tract.
In summary, while the esophagus, oropharynx, sigmoid colon, and caecum are integral portions of the digestive tract, the biliary ducts belong to the biliary system and are not considered part of the digestive tract proper.

Which of the digestive organ below is NOT part of the digestive tract proper?[Fill in the blank]

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