part_of part of part of has_part has part has part cell cell vacuole plasma membrane endomembrane system GO:0012505 Wikipedia:Endomembrane_system cellular_component A collection of membranous structures involved in transport within the cell. The main components of the endomembrane system are endoplasmic reticulum, Golgi bodies, vesicles, cell membrane and nuclear envelope. Members of the endomembrane system pass materials through each other or though the use of vesicles. cellular anatomical entity