What electrolytes does the body selectively move to where more water is needed in order to maintain fluid balance?

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The body selectively moves sodium and chloride ions to where more water is needed in order to maintain fluid balance, as these electrolytes are involved in regulating water balance in the body. Sodium is the most important electrolyte for maintaining fluid balance, and when sodium levels are low, the body retains water in order to maintain a proper balance. Chloride also plays a role in regulating water balance, as it is often found in conjunction with sodium in the body. Magnesium and calcium are important electrolytes for other bodily functions, but they are not involved in maintaining fluid balance in the same way that sodium and chloride are.

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