* Water moves into the cell: Cells are surrounded by a semi-permeable membrane. When the concentration of water outside the cell is higher than inside (hypotonic environment), water will move into the cell to try and equalize the concentration.
* Cell swells: As water enters the cell, the cell swells up.
* Pressure builds: The increased water inside the cell puts pressure on the cell membrane.
* Lysis: If the pressure becomes too great, the cell membrane can rupture, causing the cell to burst. This process is called lysis.
Why is lysis problematic?
* Cell death: Lysis is essentially the death of the cell.
* Tissue damage: If many cells in a tissue lyse, it can lead to damage to that tissue.
Factors influencing lysis:
* Concentration gradient: The difference in water concentration between the inside and outside of the cell.
* Cell wall: Plant cells have a rigid cell wall that helps prevent lysis.
* Aquaporins: These are protein channels in the cell membrane that allow water to pass through quickly.
Examples of lysis:
* Red blood cells in hypotonic solution: If red blood cells are placed in a solution with a lower concentration of solutes (hypotonic), water will move into the cells, causing them to swell and burst.
* Bacteria in water: Some bacteria can lyse when exposed to water, particularly if they are in a hypertonic environment.
In summary: While water is essential for cell function, too much water can lead to cell death through lysis. This is why maintaining the appropriate balance of water and solutes inside and outside the cell is crucial for cell survival.
