Which of the following describes the importance of potassium in maintaining body fluids and acid-base balance?
A. Potassium is the primary positive ion in intracellular fluid.
B. Potassium is the primary positive ion in extracellular fluid.
C. Potassium is the primary negative ion in extracellular fluid.
D. Potassium is the primary negative ion in intracellular fluid.
Answer: A
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