Glossary of Terms Neuron Axon Dendrite Soma Myelin Sheaths Schwann Cells Nodes of Ranvier Saltatory Conduction Synaptic Cleft Membrane Potential Resting Membrane Potential Sodium-Potassium Pump Threshold Potential Chemical Potential Action Potential Depolarization Positive Feedback Voltage-Gated Ion Channels Voltage-Gated Sodium Channels Voltage-Gated Potassium Channels Repolarization Hyperpolarization Refractory Period Absolute Refractory Period Relative Refractory Period Neurotransmitter