D movement of an action potential along the length of an axon change in voltage of a cell membrane in response to a stumulus that results in transmission of an electrical signal; unique to neurons & muscle fibers change in membrane potential that varies in size, depends on the size of the stimulus that elicits it chemical signal that is released from the synaptic end bulb of a neuron to cause a change in the target cell membrane voltage at which an action potential is initiated 1. graded potential 2. action potential 3. threshold 4. propogation 5. neurotransmitter

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