During the Firing of a Nerve Cell, the Membrane Potential

question 30

Multiple Choice

During the firing of a nerve cell, the membrane potential rises above -70 mV. The equilibrium ratio of the concentration of Cl^- ions in axoplasm to interstitium before the pulse arrives is 0.072. In which direction will the Cl^- ions flow during the passage of the pulse?

• A)They will flow from interstitium to axoplasm.
• B)They will flow from axoplasm to interstitium.
• C)No migration of Cl^- ions takes place.
• D)As the system is no longer in equilibrium, we cannot use Nernst's equation to determine the direction of flow

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