At label D, the cell membrane is closest to the potassium equilibrium potential.
At the level of the cell membrane, homeostasis prospective is the completion of the brief, directed flow of charged ions. This phase normally has zero charge, which prevents ions from moving freely between the membrane's two sides.
For any chemical change, the total of the electrolytic possibilities of the reactants and products must equal one another in order for the system to be in equilibrium and for every given species to have the same electrochemical potential throughout the system.
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