A solution is 90% water on left, and 80% water on right, of membrane that only water can cross. Assuming no other forces are operating, which direction will water move?

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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c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .

voluntary muscles are controlled by the cerebellum.