5th Edition

ISBN: 9780321976444

Author: James S. Walker

Publisher: PEARSON

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Chapter 21, Problem 81PCE

Nerve Impulse Propagation The speed with which nerve impulses travel is determined in large part by the characteristic time constant T = RC of the circuit formed by the resistivity of the axon and the capacitance of its wall. The resistance of a 1.00-mm-long segment of an axon is 25.5 MΩ. (a) For nerve axons with no protective myelin sheath, the wall capacitance is about 3.14 × 10^-10F for each segment of length L = 1.00 mm. Find the speed of the nerve impulses given by v = L/T. (b) Many axons are surrounded by a myelin sheath that decreases the wall capacitance to 1.57 × 10^-12 F. What is the speed of nerve impulses along such myelinated axons?

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Chapter 21, Problem 80PCE

Chapter 21, Problem 82PCE

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Chapter 21 Solutions

Physics (5th Edition)

Ch. 21.1 - Enhance Your Understanding 1. The following...Ch. 21.2 - Enhance Your Understanding 2. If the voltage and...Ch. 21.3 - Enhance Your Understanding 3. In the following...Ch. 21.4 - The two circuits shown in Figure 21-17 have...Ch. 21.5 - Prob. 5EYU Ch. 21.6 - Do two capacitors give a larger equivalent...Ch. 21.7 - Give a symbolic expression for the current that...Ch. 21 - Your body is composed of electric charges. Does it...Ch. 21 - Suppose you charge a comb by rubbing it through...Ch. 21 - An electron moving through a wire has an average...

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