10th Edition

ISBN: 9780321902788

Author: Hugh D. Young, Philip W. Adams, Raymond Joseph Chastain

Publisher: PEARSON

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In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the di…

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Textbook Question

Chapter 19, Problem 89PP

In a simple model of an axon conducting a nerve signal, ions move across the cell membrane through open ion channels, which act as purely resistive elements. If a typical current density (current per unit cross-sectional area) in the cell membrane is 5 mA/cm² when the voltage across the membrane (the action potential) is 50 mV. what is the number density of open ion channels in the membrane?

A. 1/cm²
B. 10/cm²
C. 10/mm²
D. 100/μm²

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Chapter 19, Problem 88PP

Chapter 19, Problem 90PP

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