Question

In a nerve cell at its resting potential, the plasma membrane is most permeable to ________ ions.

Answer 1

At resting potential, sodium and potassium molecules may most easily pass through the plasma membrane of a nerve cell.

Discussion:

• The two cations can pass through the gradient of concentration thanks to the potassium and sodium permeability channel that are present in the cell. However, potassium leakage channels are much more prevalent in neurons than sodium leakage valves. Because of this, potassium disperses within the cell far more quickly than sodium seeps in.

• K+ ions build up inside the cell while the membrane is at equilibrium as a result of a movement of molecules with the solute concentration.
• By elevating the concentration of cations in the extracellular fluid relative to those inside the cell, the negative resting membrane potential is established and sustained (in the cytoplasm).

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