You have a small tree in your yard that is the height that you want it, but does not have as many branches as you want. how can you prune it to trigger it to increase the number of branches?

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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the answer is:

carbon dioxide