OBJECTIVES 1. � To define the following terms:irritability, conductivity, resting membrane potential, polarized, sodium-potassium pump, threshold stimulus, depo- larization, action potential, repolarization, hyperpolarization, absolute refractory period, relative refractory period, nerve impulse, compound nerve action potential, and conduction velocity. 2. � To list at least four different stimuli capable of generating an action potential. 3. � To list at least two agents capable of inhibiting an action potential. 4. � To describe the relationship between nerve size and conduction velocity. 5. � To describe the relationship between nerve myelination and conduction velocity.