Which of the following statements are true of nerve tissue? (Read carefully and select all of the correct statements.)

A)The myelin sheath provides electrical insulation.
B)Astrocytes contribute to the blood-brain barrier.
C)Synaptic transmission requires rapid electrical impulses.
D)Myelin is produced by Schwann cells in the PNS and microglia in the CNS.
E)An axon carries impulses toward the cell body of a neuron.
F)The function of an inactivator is to inactivate an electrical impulse when it is no longer needed.