Functionally speaking, a nerve impulse is

Functionally speaking, a nerve impulse is
  a. a flow of electrons along the outside of the plasma membrane of a neuron.
  b. the movement of cytoplasmic elements through the core of the neuron.
  c. a series of changes in membrane potentials.
  d. a lengthening and shortening of the membrane extensions of an individual neuron.
  e. a change in the metabolic rate within a neuron.

Question 2

Neuroglial cells do all of the following EXCEPT
  a. metabolically support other neurons.
  b. form sheaths around neurons and control the rate of impulse transmission.
  c. form more than half of the volume of the brain.
  d. provide physical support.
  e. conduct action potentials.