Fish MCQ 01

Topic: Anatomy

Created on Friday, July 27 1973 by fish

Last modified on Friday, July 27 1973.

 
        A) The smaller the diameter of the axon, the faster the conduction velocity of the action potential
 
        B) Myelin allows the axon to conduct a signal faster without having to increase diameter
 
        C) Action potentials can ONLY EVER move in One Direction
 
        D) Action potentials move down the axon in a decremental fashion
 

 

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This question was created on July 27, 1973 by fish.
This question was last modified on July 27, 1973.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS

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A) The smaller the diameter of the axon, the faster the conduction velocity of the action potential

This answer is incorrect.

Larger-diameter axons have longer length constants and therefore faster conduction velocity  (See References)

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B) Myelin allows the axon to conduct a signal faster without having to increase diameter

This answer is correct.

Lipids act as insulator so electrical signals can flow through the cytoplasm of myelinated cells without significant degradation  (See References)

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C) Action potentials can ONLY EVER move in One Direction

This answer is incorrect.

I mean in a sense yes because refractory periods but they really do move in both directions, it's just that refractory periods are stopping them from going backwards  (See References)

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D) Action potentials move down the axon in a decremental fashion

This answer is incorrect.

Action potentials move down the axon in a nondecremental fashion  (See References)

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References:

1. Vanderah, T. W., & Nolte, J. (2019). Chapter 7: Electrical Signaling by Neurons. In Nolte's essentials of the human brain. essay, Elsevier.

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anatomy
Fish MCQ 01
Question ID: 112622109
Question written by fish. (C) FrontalCortex.com 2006-2009, all rights reserved. Created: 07/27/1973
Modified: 07/27/1973
Estimated Permutations: 24