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Physiological ions play a crucial role in maintaining homeostasis, cellular function, and biochemical processes in the human body. Sodium (Na⁺) is the major extracellular cation responsible for maintaining osmotic balance, regulating blood pressure, and generating action potentials in nerves and muscles. Its concentration is tightly controlled by the kidneys and the renin-angiotensin system. Potassium (K⁺) is the ___ ____ ______ ______ ____ ________ __________ _____.
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