We can model some of the electrical properties of an unmyelinated axon as an electric cable covered
Question:
A current of ions can travel along the axon in this fluid and can also leak out through the membrane. The inner radius of the cylinder is 5.0 μ m; the membrane thickness is 8.0 nm.
(a) If the resistivity of the axon fluid is 2.0 Ω · m, calculate the resistance of a 1.0-cm length of axon to current flow along its length.
(b) If the resistivity of the porous membrane is 2.5 × 107 Ω · m, calculate the resistance of the wall of a 1.0-cm length of axon to current flow across the membrane.
(c) Find the length of axon for which the two resistances are equal. This length is a rough measure of the distance a signal can travel without amplification.
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Related Book For
Physics
ISBN: 978-0077339685
2nd edition
Authors: Alan Giambattista, Betty Richardson, Robert Richardson
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