When we discuss the "physiological concentrations of Na* and K+", what actually sets these concentrations? O Nat is pushed out of the cell by positive charge and K+ is pulled into the cell by negative charge. O Active transport uses energy to transport Na* out of the cell and K+ into the cell. O Na+ and K+ repel each other, therefore stay on opposite sides of the cell membrane. O The cell membrane is not permeable to either Na+ or K+, therefore they don't move from their respective positions.

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Osmosis

In simple words, osmosis is the slow, gradual movement of a liquid through a membrane. But there are nuances to this process. For instance, there has to be an imbalance in the distribution of solute in the liquid on either side of the membrane, which has to be semipermeable. The liquid in the region with a lower solute concentration moves to the region with a higher concentration, thereby displacing the solution in the process. The objective is to equalize the concentration of molecules on both sides of the membrane; the displacement of liquid can be viewed as a byproduct of this equalization. Since there is no energy required to carry osmosis, it is considered a passive process.