contractile vacuole


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contractile vacuole

n.
A membrane-bound organelle found in certain protists that pumps fluid in a cyclical manner from within the cell to the outside by alternately filling and then contracting to release its contents at various points on the surface of the cell. It functions in maintaining osmotic equilibrium.
References in periodicals archive ?
Amoeba proteus expresses a single AQP that is present in the contractile vacuole complex required for osmoregulation, whereas Dictyostelium discoideum expresses four AQPs, of which two are present in the single-celled amoeboidal stage and two more in the later multicellular stages preceding spore formation.
cruzi, the etiologic agent of Chagas disease, and Peter Rohloff showed that this protein is translocated to the contractile vacuole upon hypo-osmotic stress.
The movement of the fluid in gastrovascular systems of cnidarians could be driven by contractions of the epitheliomuscular cells (Van Winkle and Blackstone, 1997) or contractile vacuoles (Schierwater et al.