A nerve impulse is best described as?

Question

A. an enzyme-requiring chemical reaction inside the neuron's axon.

B. the diffusion of sodium and potassium ions along the neuron after being released from the dendrite.

C. a result of a change in osmotic pressure between inner and outer surfaces of the axon's membrane.

D. an electrochemical process involving diffusion and active transport of sodium and potassium ions, occuring along the surface of the neurons membrane.

Answer 1

D. an electrochemical process involving diffusion and active transport of sodium and potassium ions, occuring along the surface of the neurons membrane.

Think of an impulse as a wave of depolarisation moving down the nerve fibre.