Question
3. A myelinated nerve fiber has a 4.0-m-diameter cylindrical axon covered by a 1.0-m-thick layer of myelin. No ions pass through the axon membrane, which
3. A myelinated nerve fiber has a 4.0-m-diameter cylindrical axon covered by a 1.0-m-thick layer of myelin. No ions pass through the axon membrane, which is sealed by the myelin, but an action potential at a node causes an ion current to flow along the axis of the axon. The axon is filled with cytosol, whose resistivity was given in Chapter 24 as 0.50 m The dielectric constant of myelin is assumed to be 5.0, the same as that of the cell membrane
a) What are the capacitance in pF and the resistance in M of a 1.0-mm-long segment of a myelinated nerve fiber? Use the average radius of the myelin sheath for calculating capacitance.
b) What is the time constant in s of this RC circuit
According to the etext the answers were
a, 0.70, 1.99 x10^7 ohms
b is 14
can you guys please explain the calculations for number one because multiplying those answers can be use to get b
Thanks
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