What is a defining characteristic of a hypotonic solution?

A hypotonic solution is defined by having a lower solute concentration than the cell's interior. In biological terms, when a cell is placed in a hypotonic solution, the concentration of solutes outside the cell is less than that inside the cell. This creates an osmotic gradient where water moves into the cell to equilibrate the solute concentrations.

As water enters the cell, it can cause the cell to swell, and if the influx of water is substantial enough, it may lead to cell lysis. This characteristic is important in various physiological processes, including the effects of IV fluids on cell hydration and the maintenance of osmotic balance in different body compartments.

Understanding this concept is crucial for paramedics and healthcare providers, especially when administering treatments that impact fluid balance and recognizing conditions related to dehydration or overhydration.