試題詳解

9. Which of the following statements about myelin is correct?
(A) Myelin is distributed on the dendrites and axons of nerve cells, providing insulation and accelerating nerve signal transmission.
(B) Myelin in the peripheral nervous system is composed of Schwann cells, which accelerate action potential transmission.
(C) Myelin in the central nervous system is composed of Schwann cells, which accelerate action potential transmission.
(D) Myelin in the central nervous system is primarily located in the gray matter region to ensure the precision of signal transmission.