What are benefits of using tissue cultures to study medications used for treating cancer cells

Medication can be tested on the cancer culture before being injected into the patient.

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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i don't know, but does anyone wanna be friends? i'm doing my homework at 1: 49 in the morning : /