The membrane-bound enzyme system that restores and maintains the resting membrane potential is ...

The membrane-bound enzyme system that restores and maintains the resting membrane potential is
  which of the following pumps?
  a. sodium-phosphorus
  b. sodium-potassium
  c. sodium-chlorine
  d. phosphorus-calcium
  e. phosphorus-chlorine

Question 2

During the passage of a nerve impulse all of the following occur EXCEPT
  a. sodium ions pass through gated channels.
  b. positive feedback causes more sodium ions to enter the cell.
  c. the interior of the cell becomes positive.
  d. changing voltage increases the number of open gates.
  e. changing voltage decreases the number of open gates.