Hypertonic Solution: A High Concentration of Solutes
* Hypertonic means the solution surrounding the cell has a higher concentration of solutes (like salts, sugars) than the cell's internal environment (cytoplasm).
* Water tends to move from areas of high water concentration (low solute concentration) to areas of low water concentration (high solute concentration) to try and equalize the solute concentrations.
Plant Cell Response
* Plasmolysis: Water moves out of the plant cell's vacuole and cytoplasm into the hypertonic solution.
* Cell Membrane Pulls Away: As water exits, the cell membrane pulls away from the cell wall. This shrinking of the cytoplasm is called plasmolysis.
* Cell Wall Remains: The rigid cell wall provides structural support and prevents the cell from completely collapsing.
* Turgor Pressure Loss: The cell loses turgor pressure, the internal pressure that helps maintain the plant's upright shape.
* Potential for Recovery: Plant cells can often recover from plasmolysis if they are placed back in a hypotonic or isotonic solution (where the water concentration is equal or higher inside the cell).
Animal Cell Response
* Crenation: Water moves out of the animal cell into the hypertonic solution, causing the cell to shrink and shrivel.
* Cell Membrane Shrinks: The cell membrane pulls away from the cytoplasm, often forming a wrinkled appearance.
* No Cell Wall: Animal cells lack a rigid cell wall, so they cannot withstand the pressure changes as effectively as plant cells.
* Possible Damage: This water loss can disrupt cellular processes and potentially lead to cell death.
Summary
While both plant and animal cells experience water loss in a hypertonic solution, the presence of a cell wall in plants allows them to maintain some structural integrity and potentially recover from plasmolysis. Animal cells, lacking a cell wall, are more vulnerable to crenation and potential cell damage.
