contrast with a multi-tissue tube, which has as parts both epithelium, connective tissue, possibly muscle layers

Epithelial tubes transport gases, liquids and cells from one site to another and form the basic structure of many organs and tissues, with tube shape and organization varying from the single-celled excretory organ in Caenorhabditis elegans to the branching trees of the mammalian kidney and insect tracheal system.

epithelial or endothelial tube

uberon

UBERON:0003914

http://purl.obolibrary.org/obo/uberon.owl, http://purl.obolibrary.org/obo/cl.owl

• epithelial tube formation

• epithelial tube morphogenesis