Term Name:	contractile vacuole
Synonyms:	central bladder, central vacuole
Definition:	A specialized vacuole of eukaryotic cells, especially Protozoa, that fills with water from the cytoplasm and then discharges this externally by the opening of contractile vacuole pores. One of its functions is osmoregulatory.
Ontology:	GO: Cellular Component [GO:0000331]    QuickGO    AmiGO