In a Cell at Rest, the Driving Force on Sodium

question 44

Multiple Choice

In a cell at rest, the driving force on sodium is high, while the permeability of sodium is low. As a consequence, which of the following is true of the cell's membrane potential at rest?

• A) Sodium ion concentrations have a small influence on the resting membrane potential.
• B) Small changes in extracellular sodium concentration will have a large impact on the membrane potential.
• C) Sodium is at equilibrium at the resting membrane potential.
• D) Small changes in the intracellular sodium concentration will have a large impact on the membrane potential.
• E) Sodium ion concentrations do not contribute to the resting membrane potential.

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