In hypotonic conditions (freshwater), the cell absorbs water by osmosis. It regulates osmotic pressure with the help of bladder-like contractile vacuoles, gathering internal water through its star-shaped radial canals and expelling the excess through the plasma membrane.
In freshwater, a cell absorbs water through osmosis. To maintain equilibrium, it uses contractile vacuoles to gather internal water via radial channels and release excess through its membrane.