What’s the difference between a primary source and a secondary source? A primary source was written by someone who actually experienced the event.

The difference is about where the source appears—online or in print.

Primary sources are shorter than secondary sources. The difference is about how closely the source relates to your topic.

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"A primary source was written by someone who actually experienced the event."

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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