How did scientists change society's view of smoking after 1960?

a. they showed that it relieved stress.
b. they showed that smoking causes cancer.
c. they showed that cigarettes could be made more cheaply.
d. they showed that smoking increases stress.

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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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