The neurobiologist explained to the students, "The neural system is very much like the wires connecting your TV and stereo to the electrical outlet. If the wires were not covered with insulation, the signal would short circuit." The neurobiologist was describing the function of the:

Question

a. terminal button.
b. axon.
c. inhibitory system.
d. myelin sheath.

I think it is either c or d but I am not too sure.