Neuron Action Potential

Topic: Physiology

Created on Tuesday, February 6 2007 by jdmiles

Last modified on Tuesday, February 6 2007.

 
        A) Sodium flows into the cell, and Potassium flows out of the cell
 
        B) Calcium flows into the cell, and Chloride flows out of the cell
 
        C) Potassium flows into the cell, and Chloride flows out of the cell
 
        D) Potassium flows into the cell, and Sodium flows out of the cell
 
        E) Calcium flows into the cell, and Sodium flows out of the cell
 

 

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This question was created on February 06, 2007 by jdmiles.
This question was last modified on February 06, 2007.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS

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A) Sodium flows into the cell, and Potassium flows out of the cell

This answer is correct.

The properties of an action potenial are primarily determined by the interplay between sodium and potassium ionic currents. During an action potential, sodium flows into the neuron, causing depolarization. Potassium flows out of the cell, helping to restore membrane resting potential. Other ions are typically involved, however these are the two ionic currents which are believed to have the largest impact on the morphology of the action potential.  (See References)

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B) Calcium flows into the cell, and Chloride flows out of the cell

This answer is incorrect.

The properties of an action potenial are primarily determined by the interplay between sodium and potassium ionic currents. During an action potential, sodium flows into the neuron, causing depolarization. Potassium flows out of the cell, helping to restore membrane resting potential. Other ions are typically involved, however these are the two ionic currents which are believed to have the largest impact on the morphology of the action potential.  (See References)

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C) Potassium flows into the cell, and Chloride flows out of the cell

This answer is incorrect.

The properties of an action potenial are primarily determined by the interplay between sodium and potassium ionic currents. During an action potential, sodium flows into the neuron, causing depolarization. Potassium flows out of the cell, helping to restore membrane resting potential. Other ions are typically involved, however these are the two ionic currents which are believed to have the largest impact on the morphology of the action potential.  (See References)

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D) Potassium flows into the cell, and Sodium flows out of the cell

This answer is incorrect.

The properties of an action potenial are primarily determined by the interplay between sodium and potassium ionic currents. During an action potential, sodium flows into the neuron, causing depolarization. Potassium flows out of the cell, helping to restore membrane resting potential. Other ions are typically involved, however these are the two ionic currents which are believed to have the largest impact on the morphology of the action potential.  (See References)

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E) Calcium flows into the cell, and Sodium flows out of the cell

This answer is incorrect.

The properties of an action potenial are primarily determined by the interplay between sodium and potassium ionic currents. During an action potential, sodium flows into the neuron, causing depolarization. Potassium flows out of the cell, helping to restore membrane resting potential. Other ions are typically involved, however these are the two ionic currents which are believed to have the largest impact on the morphology of the action potential.  (See References)

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References:

1. Kandel, E.R., Schwartz, J.H., and Jessel, T.M. (2000). Principles of Neural Science, 4th ed. McGraw-Hill, New York.

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physiology
Neuron Action Potential
Question ID: 020607076
Question written by J. Douglas Miles, (C) 2006-2009, all rights reserved.
Created: 02/06/2007
Modified: 02/06/2007
Estimated Permutations: 1275120