1) What is the result of water flowing through a channel filled with obstacles? 2) What is the result of a stream that collects runoff from a large watershed?
3) What is the result of a stream flowing through a wide and spread out path?
4) What type of energy does a stream have if it is not doing any traction or saltation?

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 correct answer is b

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.