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