Which part of the diagram is considered nerve fiber?
A)A
B)D
C)I
D)Both A and D
E)All of these choices make up the nerve fiber

Question

Which part of the diagram is considered nerve fiber? 
A)A 
B)D 
C)I 
D)Both A and D 
E)All of these choices make up the nerve fiber

Quizplus · Accepted Answer

Both A and D make up the nerve fiber. A is the axon, which is the long, slender projection of a neuron that transmits signals to other neurons or to muscles or glands. D is the myelin sheath, which is a layer of fatty insulation that surrounds and speeds up the transmission of signals along the axon. Together, the axon and myelin sheath make up the nerve fiber.

Which Part of the Diagram Is Considered Nerve Fiber