tube 管 epithelium 上皮 epithelial tube 上皮管 AEO:0000114 EHDAA2:0003114 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. FBbt:00007474 UBERON:0003914 contrast with a multi-tissue tube, which has as parts both epithelium, connective tissue, possibly muscle layers epithelial or endothelial tube epithelial or endothelial tube uberon 上皮或内皮管 上皮或内皮管 上皮管将气体、液体和细胞从一个地方输送到另一个地方，并形成许多器官和组织的基本结构，具有与秀丽隐杆线虫的单细胞排泄器官乃至哺乳动物肾和昆虫的分枝树气管系统不同的管状和组织结构。 与多层组织管相比，其有上皮细胞，结缔组织，可能有肌肉层。