because salt is a preservative
to prevent contamination of the body
to maintain the composition of body fluids
to increase the number of blood cells
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Hospitals use saline solutions to hydrate patients instead of distilled water because saline solution has sodium as well as water, which is needed for muscles and nerves to work properly. This allows for the patients that are dehydrated to replenish the salt the lost from their body's with the saline solution.
Hospitals use saline solutions (normal saline, 0.9% sodium chloride solution) as IV drips instead of plain water because:
- *Isotonic with blood*: Saline solution has a similar concentration of salts (electrolytes) as human blood, so it's gentle on cells and doesn't cause them to swell or shrink.
- *Prevents cell damage*: Water alone would be hypotonic, causing cells to swell and potentially burst (hemolysis).
- *Replenishes electrolytes*: Saline provides essential electrolytes like sodium and chloride, helping maintain proper fluid balance and bodily functions
