Question

Which of the following is TRUE of voltage-dependent ionic current?

A. A delayed influx of Na+ into the neuron produces a transient inward current
B. A delayed influx of K+ into the neuron produces a sustained outward current
C. An early influx of Na+ into the neuron produces a transient inward current
D. A delayed efflux of Na+ out of the neuron produces a sustained outward current
E. None of the above are true

Answer 1

During an action potential, an early influx of Na+ into the neuron produces a transient inward current, which is described as a voltage-dependent ionic current.

Step-by-step explanation:

The correct answer is C. An early influx of Na+ into the neuron produces a transient inward current.

During an action potential, the cell membrane becomes permeable to Na+ ions, causing an influx of Na+ into the neuron. This influx of Na+ ions depolarizes the membrane and creates a transient inward current.

After depolarization, the membrane becomes impermeable to Na+ ions and permeable to K+ ions. This allows K+ ions to move out of the neuron, repolarizing the membrane and creating a sustained outward current, which is not mentioned in any of the provided options.