Answer: K+ flowing out restoring negative inside.
- A Na+ flowing in, depolarizing the membrane further
- B K+ flowing out restoring negative inside
- C Ca<sup>2+</sup> entering through voltage-gated channels at the terminal
- D Cl- flowing in, hyperpolarizing the resting membrane
Correct answer: B. K+ flowing out restoring negative inside
Explanation: Repolarization: K+ channels open and K+ flows out of the cell, restoring the negative resting membrane potential.
Structure of a neuron. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.
Concept context
Brain, spinal cord, neurons, reflex arcs, and sense organs.