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Physiological ions play a vital role in maintaining cellular functions, transmitting signals, and regulating various processes in the human body. One of the most important ions is sodium (Na⁺), which is essential for maintaining fluid balance, generating action potentials in nerve cells, and regulating muscle contraction. The sodium-potassium _______ _______ ____ ___ _______ _______ ______ ______ ______ ______ ____.
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