The major importance of regulating ECF osmolarity is A) to help maintain blood pressure B) to prevent the urine from becoming too concentrated C) to prevent fluid shifts between the cells and the extracellular fluid, which could produce profound symptoms as the cells swell or shrink D) to prevent spontaneous depolarization of nerve and muscle cell membranes because of shifts in Na⁺ balance E) to prevent an acid-base imbalance if the hydrogen ions were to become too concentrated or too dilute in the body fluids

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Regulating ECF osmolarity is crucial to prevent fluid shifts between the cells and the extracellular fluid, which could result in significant symptoms as the cells either swell or shrink. This important function helps to maintain normal cell function and overall organism health. While blood pressure, concentrated urine, prevention of spontaneous depolarization of nerve and muscle cell membranes, and acid-base balance are important physiological functions, they are not directly related to regulating ECF osmolarity.

The Major Importance of Regulating ECF Osmolarity Is