Which of the following does NOT correctly describe kidney function? They assist in maintaining proper acid-base balance in the body. They produce urine of a constant composition at all times, in order to maintain homeostasis of extracellular fluid. They excrete metabolic waste products. They contribute significantly to long-term regulation of arterial blood pressure by maintaining the proper plasma volume. They secrete hormones.

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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thats not a question