Question

Explain the terms isotonic solution, crenation, and hemolysis.

Short answer

An isotonic solution has the same solute concentration as the cell's interior, maintaining cell size and shape. Crenation occurs in a hypertonic solution, causing cells to shrink and take on an irregular shape due to water moving out of the cell. Hemolysis happens in a hypotonic solution, where cells swell and rupture due to water moving into the cells, resulting in the release of intracellular components and impaired oxygen transport.

Step-by-step solution

1. Define Isotonic Solution

An isotonic solution is a solution with the same concentration of solutes (dissolved particles) as another solution, often referring to the concentration inside and outside of a cell. In biological contexts, an isotonic solution does not result in a net movement of water across the cell membrane, so the size and shape of the cell remain constant. This balance between solutes and water in the cell maintains its normal function without damage. An example of an isotonic solution is a saline solution in medical applications, as it has a similar salt concentration to that found in human cells and blood plasma.

2. Define Crenation

Crenation occurs when a cell is exposed to a hypertonic solution (a solution with a higher concentration of solutes compared to the cell's interior), and water moves out of the cell through the process of osmosis. As water moves out, the cell begins to shrink and take on a notched, curled, or irregular shape, often described as a "crenated" appearance. The crenation process can negatively impact cell function and, if severe enough, may lead to cell death. Crenation is particularly relevant in red blood cells, where loss of cell shape and function can impair their ability to transport oxygen throughout the body.

3. Define Hemolysis

Hemolysis is the rupture or destruction of red blood cells, which often occurs when cells are exposed to a hypotonic solution (a solution with a lower concentration os solutes compared to the cell's interior). In a hypotonic environment, water moves into the cell through osmosis to balance the solute concentrations, causing the cell to swell. If the osmotic pressure becomes too great, the cell membrane can break, releasing its contents and resulting in hemolysis. Hemolysis can be detrimental to the body, as it impairs the ability of red blood cells to transport oxygen and can release toxic intracellular components into the bloodstream. In conclusion, understanding isotonic solutions, crenation, and hemolysis is essential for grasping the effects of solute concentrations on cells and their functions in various biological contexts.