Which of the following statements about myelination is false?
- Myelin sheaths are created by glial cells.
- Myelin serves to sharply increase the time constant of the axon.
- Multiple layers of closely opposed glial membranes wrap the axon and serve as an electrical insulator.
- Myelin is absent at the nodes of Ranvier.
- Sodium and potassium channels are clustered at the nodes of Ranvier.
Answer: 2