In the condition that occurs when the concentration of water is higher outside the cell than inside the cell, osmosis causes the contractile vacuole to fill with water from the outside environment.
The contractile vacuole are membrane-bound organelles whose function is to pump water out of the cell through a process called osmoregulation, the regulation of osmotic pressure.
The function of these organelles is vital for certain protozoa that live in fresh water, because in a hypotonic environment (low in salts), the water easily crosses the cell membrane by osmosis until causing the destruction or lysis of the cell if it is not expels the excess in a timely manner.
Therefore, due to osmosis, the amount of water that is actively transported out of the cell is equal to that that enters the cell, and there is no variation in the tonicity of the cell.
Therefore, we can conclude that the contractile vacuole that has the ability to store the water that enters the cell and then expel it through the contraction of filaments located around it.
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