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Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Question

Transcribed Image Text:At the Nernst equilibrium potential of K* in a typical neuron,
A. Na* flows out of the cell
B. Nat flows into the cell
C.
The net flow of Na in and out the cell is zero.
D. Nat, Kt-ATPase stops pumping Na*
E. Nat, Kt-ATPase stops pumping KT
Expert Solution

Step 1
The equilibrium potential is the particular membrane potential where the net flow through any open channel is 0.
In mammalian neurons, the equilibrium potential for Na+ is +60mv and for k+ is -88mv.
Ions can move in either direction through a channel.
The direction of movement changes depending upon the membrane voltage, because the concentration gradient are essentially unchanging.
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