The difference is in the relative concentrations of the water in each case compared to the electrolytes. If a membrane separates two solutions, water will cross the membrane in a direction that moves it from high water concentration to low water concentration. Our bodies are less than 1% ions or 99% water and sea water is about 3% ions or 97% water. Separated from sea water at 97%, body fluids will cross the barrier from 99% concentration (inside your body) to 97% (outside your body).
The salt water will suck out your water as easily as the sun will evaporate it.
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