The outside of a neuron is positively charged at resting potential.Why do K⁺ ions leave the cell when K⁺ channels open during an action potential? A)The diffusion gradient is the only factor that affects ion movement. B)K⁺ ions are actively pumped out by the sodium-potassium pump acting in reverse. C)Voltage-gated K+ channels open when membrane potential reaches +50 mV during the depolarization phase.The diffusion gradient and electrical force cooperate to drive K+ ions out of the cell. D)Negatively charged proteins leave the cell at the onset of the action potential.

Question

Quizplus · Accepted Answer

Voltage-gated K+ channels open when membrane potential reaches +50 mV during the depolarization phase. The diffusion gradient and electrical force cooperate to drive K+ ions out of the cell. This is called repolarization, and it returns the neuron to its resting potential state.

The Outside of a Neuron Is Positively Charged at Resting