A Nerve Impulse Is Caused by

Multiple Choice

A nerve impulse is caused by

A) the movement of a sodium ion all the way from dendrite to axon tip.
B) the movement of a potassium ion all the way from dendrite to axon tip.
C) the movement of an electron all the way from dendrite to axon tip.
D) a change in the difference in positive and negative ions on the outer and inner surfaces of the neuron membrane,a change that opens adjacent channels and propagates its flow.
E) a change in the difference in sugar molecules on the outer and inner surfaces of the neuron membrane that opens adjacent channels.