Respuesta :
The correct answer is (A) potassium.
While potassium and phosphate are the major ions in the intracellular fluid, sodium chloride makes up the majority of the extracellular fluid. What ion does intracellular fluid contain? The main cation and anion in extracellular fluid, respectively, are sodium and chloride. In the intracellular fluid, potassium is the main cation. The ECF's main nonpenetrating solute is NaCl. The charge on its ions prevents them from smoothly passing through the phospholipid bilayer of the cell membrane. Although some does enter cells, ATPases pump out at a rate that is about equal, rendering this substance effectively impenetrable. The concentration of osmotically active particles in a solution is measured by osmolarity. Chemists may refer to it as a "collaborative" characteristic of the solution.
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