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The contractile vacuole has several structures attached to it in most cells, such as membrane folds, tubules, water tracts and small vesicles. These structures have been termed the spongiome; the contractile vacuole together with the spongiome is sometimes called the "contractile vacuole complex" (CVC). The spongiome serves several functions in ...
A contractile vacuole is a specialized osmoregulatory organelle that is present in many free-living protists. [25] The contractile vacuole is part of the contractile vacuole complex which includes radial arms and a spongiome.
Paramecium caudatum [1] is a species of unicellular protist in the phylum Ciliophora. [2] They can reach 0.33 mm in length and are covered with minute hair-like organelles called cilia. [3] The cilia are used in locomotion and feeding. [2] The species is very common, and widespread in marine, brackish and freshwater environments. [4] [5]
Anything left in the food vacuole by the time it reaches the cytoproct is discharged by exocytosis. Most ciliates also have one or more prominent contractile vacuoles , which collect water and expel it from the cell to maintain osmotic pressure , or in some function to maintain ionic balance.
A single contractile vacuole is positioned at the posterior end of the organism, attached to a collecting canal that extends towards the anterior end. When filled with fluid, the vacuole takes up a substantial portion of the posterior end. The distinction between the contractile vacuole and the rest of the cytoplasm is usually very clear. [6 ...
Vacuoles are cellular organelles that contain mostly water. [citation needed] Plant cells have a large central vacuole in the center of the cell that is used for osmotic control and nutrient storage. Contractile vacuoles are found in certain protists, especially those in Phylum Ciliophora.
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Protist Paramecium aurelia with contractile vacuoles. Amoeba makes use of contractile vacuoles to collect excretory wastes, such as ammonia, from the intracellular fluid by diffusion and active transport. As osmotic action pushes water from the environment into the cytoplasm, the vacuole moves to the surface and pumps the contents into the ...