After injuring his knee, kai began having pain and numbness in his lower leg. the doctor said the injury damaged nerves that run all the way down his leg.

damage to which system is causing kai's pain and numbness?

Peripheral nervous system

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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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