In isotonic NaCl, red blood cells have their typical volume. In NaCl 0.9%, erythrocytes stay intact, resulting in an opaque solution. Conversely, distilled water is hypotonic to red blood cells.
When a cell is immersed in a hypertonic solution, there is a net flow of water out of the cell, causing it to lose volume.
When a cell is immersed in a hypotonic solution, there is a net flow of water into the cell, and the cell expands.
When a cell is immersed in an isotonic solution, there is no net movement of water into or out of the cell, and the volume of the cell remains constant
The solute potential is equal to the water potential in a totally plasmolyzed cell, and the pressure against the cell wall is zero.
The water pressure inside plant cells is known as turgor pressure, and it is maintained through osmosis. The force within the cell that pushes the plasma membrane against the cell wall is known as turgor pressure.
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