Alimentary tract and Digestive tube

Alimentary tract noun - Tubular passage of mucous membrane and muscle extending about 8.3 meters from mouth to anus; functions in digestion and elimination.

Digestive tube is a synonym for alimentary tract in digestive tract topic. In some cases you can use "Digestive tube" instead a noun phrase "Alimentary tract", when it comes to topics like gastrointestinal tract.

Digestive tube noun - Tubular passage of mucous membrane and muscle extending about 8.3 meters from mouth to anus; functions in digestion and elimination.

Alimentary tract is a synonym for digestive tube in digestive tract topic. You can use "Alimentary tract" instead a noun phrase "Digestive tube", if it concerns topics such as gastrointestinal tract.