In a Voltage Clamp Experiment, You Observe That the Magnitude

Multiple Choice

In a voltage clamp experiment, you observe that the magnitude of the sodium current decreases when the membrane potential is stepped between +10 and +50 mV. Why?

A) The driving force on sodium decreases as membrane potential increases.
B) The equilibrium potential for sodium decreases as membrane potential increases.
C) The voltage difference opens fewer sodium channels as membrane potential increases.
D) The resting potential of the neuron decreases as membrane potential increases.
E) The leak conductance decreases as membrane potential increases.