ANATOMY & PHYSIOLOGY LL W/CONNECT ACCESS
ANATOMY & PHYSIOLOGY LL W/CONNECT ACCESS
4th Edition
ISBN: 9781265521363
Author: McKinley
Publisher: MCG
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Chapter 12.7, Problem 18WDYL
Summary Introduction

To determine:

The role of ions, phospholipid bilayer and the plasma membrane channels in neurons relative to the concepts of current, voltage and resistance.

Concept introduction:

A neuron is a basic functional unit of the nervous system and is the specialized cells of the nervous system that makes a complex network for the transmission of messages. A neuron is made up of a cell body, nerve fibers: dendrites and an axon in its structure.

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what is the role of (1) electrochemical gradient created by ions, (2) permeability of the membrane proteins to such ions, (3) strength of stimulus, and (4) duration of the refractory period in the generation and propagation of action potential.
If: membrane potential=-70mV, ENa=+60mV, and Ex=-90mV, consider which directions Na+ and K+ will leak across the membrane. If both ions are crossing the membrane, what is the most important factor in determining whether membrane potential will become more positive or more negative?
What kind of graded potential describes a change in membrane potential from  70 to  60 mV? From  70 to  80 mV?

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