The steps of the action potential are listed in random order. A. The nerve impulse moves down the axon. B. The inside of the membrane becomes positive, and the outside becomes negative. C. A stimulus is received by the dendrites. D. The membrane has a resting potential that is positive on the outside and negative on the inside. Which of these lists the steps in the correct order?

First, the neuron is at its resting potential, with the outside of the membrane positive and the inside negative (D). A stimulus is then received by the dendrites (C), causing the membrane to depolarize so the inside becomes positive and the outside negative (B). This change travels along the axon as the nerve impulse (A), so the correct order is D, C, B, A: choice B.

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