Consider the nerve fiber discussed in Example 19.10. Assume the fi ber is coated with a layer of myelin that is 100 nm thick. If the dielectric constant of myelin is the same as for a lipid layer, what is the time constant of this fiber? Ignore the gaps in the myelin sheath in Figure 19.41. These gaps are called nodes of Ranvier.

 

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The myelin coating increases the thickness of the membrane, making the capacitance smaller. Myelin sheath Node of Ranvier 1 mm Ахоn Figure 19.41