If serum sodium levels are elevated, sodium is exchanged with potassium so that homeostasis is restored.

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This statement is true. If serum sodium levels are elevated, the body will respond by exchanging sodium ions for potassium ions, in order to restore homeostasis and maintain the proper electrolyte balance. This process is known as the sodium-potassium pump, and it is a vital part of many physiological processes, such as muscle function, nerve impulse transmission, and fluid balance.

If Serum Sodium Levels Are Elevated, Sodium Is Exchanged with Potassium