What else are extreme sports sometimes called?

The term extreme sports is sometimes called action or adventure sports. Is used to describe a number of relative newer sporting activities that involve action, adrenaline and risky.

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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b exhibiting favoritism toward the kikuyu people.