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Why do freshwater protozoa need contractile vacuoles?

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Osmosis is constantly driving water into a protozoan because they are enclosed by a semipermeable membrane that can not keep the water out. The contractile vacuoles make it possible for a protozoan to get the water out. read more

Freshwater protozoan require contractile vacuole to regulate the amount of water in its body /cell because the liquids ,in the form of waste water etc ,present in protozoan are more concentrated than the surrounding freshwater water due to presence of different acid ,etc . read more

The contractile vacuoles make it possible for a protozoan to get the water out. If they did not, the end result would be the water would eventually rupture the protozoan. Below is a ~30 second video that nicely illustrates how this works. read more

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