Understanding Tonicity
* Isotonic: The concentration of solutes (like salt) inside and outside the cell is the same. Water moves in and out of the cell at equal rates, maintaining its normal size and shape.
* Hypotonic: The concentration of solutes is lower outside the cell than inside. Water rushes into the cell, causing it to swell and potentially burst (lysis).
* Hypertonic: The concentration of solutes is higher outside the cell than inside. Water rushes out of the cell, causing it to shrink and shrivel (crenation).
Hypertonic Salt Solution and Blood Cells
1. Water Movement: When a blood cell is placed in a hypertonic salt solution, the concentration of salt is higher outside the cell than inside. This creates a concentration gradient, driving water out of the cell through osmosis.
2. Cell Shrinkage: As water leaves the cell, the cell's internal pressure decreases, causing it to shrink and become wrinkled, a process called crenation.
3. Cellular Function Disruption: The loss of water disrupts the normal functioning of the cell. Important cellular processes, like metabolism and protein synthesis, become impaired.
4. Potential Death: If the water loss is severe enough, the cell will eventually die. This is because vital organelles and structures within the cell become damaged and the cell can no longer function.
In summary: A hypertonic salt solution draws water out of blood cells, causing them to shrivel and eventually die due to the disruption of cellular function and organelle damage.
