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Why does a protist living in saltwater doesn need a contractile vacuole?

April 26, 2017contractile Living protist saltwater vacuole

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Why does a protist living in saltwater doesn need a contractile vacuole?

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*****Another way to explain this is that the contractile vacuole is used to pump water out of the cells. In salt water the water potential is lower than the water in the protist. Water always wants to move towards the solute/lower water potential. As a result, the protist is always losing water since the water is moving towards the salt in the saltwater. A saltwater protist wouldn’t want to be pumping water out of its body, if its already losing it.