Which of the following most accurately describes the cellular activity associated with the actual ...

Which of the following most accurately
  describes the cellular activity associated with
  the actual passage of a nerve impulse?
  a. electrical discharge
  b. action of sodium-potassium pump
  c. positive feedback
  d. hyperpolarization followed by rebalancing
  e. active transport of ions

Question 2

The neuron transport proteins that maintain the
  resting membrane potential and restore ion
  gradients following an action potential are
  a. sodium-phosphorus passive transporters.
  b. sodium-potassium pumps.
  c. sodium-chlorine gated channels.
  d. phosphorus-calcium pumps.
  e. phosphorus-chlorine gated channels