A vacuole in some protozoans which expels excess liquid on contraction.
- The cytoplasm contains, in addition to digestive vacuoles, contractile vacuoles which probably function in the control of osmotic pressures.
- The amount of contractile vacuoles can tailor in accordance with suctorian species, age and size.
- The purpose of the contractile vacuole is to expel excess water from the cell, preventing the cell from swelling up.
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