Final answer:
When electrical impulses travel in a backward direction, it is known as a reversal of electrical charge across the membrane of a resting neuron.
Step-by-step explanation:
When the electrical impulses travel in a backward direction, this is known as a reversal of electrical charge across the membrane of a resting neuron. It can be understood as a retrograde action potential that travels down the axon of the neuron as a nerve impulse. The reversal of electrical charge is an important mechanism in the communication and coordination of signals within the nervous system.