A Myelinated Nerve Fiber is ________, Whereas an Unmyelinated Nerve Fiber

Question

A myelinated nerve fiber is ________, whereas an unmyelinated nerve fiber is ________.
A)gray, and composing the gray matter of the brain and spinal cord; white, and composing the white matter of the brain and spinal cord
B)white, and composing the gray matter of the brain and spinal cord; gray, and composing the white matter of the brain and spinal cord
C)white, and composing the white matter of the brain and spinal cord; gray, and composing the gray matter of the brain and spinal cord
D)white, and composing the gray matter of the brain and spinal cord; red, and composing the white matter of the brain and spinal cord

Accepted Answer

A myelinated nerve fiber is white and composes the white matter of the brain and spinal cord because the myelin sheath is made of lipids that are white in color. An unmyelinated nerve fiber is gray and composes the gray matter of the brain and spinal cord because it lacks the white myelin sheath.