[问答题]
1.Explain why a rest5h; *kfepc ycskuq*z.r2,3jaing potec-b*p) (te*mu4b cs ,mhxnnn +vf6d/antial is negative.
2.Explain how the structure of a neuron is adapted to its function.
3.Describe the events that occur to propagate an action potential within a neuron and between two neurons.
