What change in a neuron is being measured in the graph? Membrane potential (mv) +30 0 -70 00 B C 2 Time (ms) the voltage measured between the neuron cell body and the axonal terminals the voltage measured across the axon membrane at a specific point as an action potential travels past the speed of an action potential as it moves down the length of an axon the voltage measured across the axon membrane at various points along an axon at a specific instance during an action potential