How can we improve FrontalCortex? Let us know.

Neuron Action Potential 2

Topic: Physiology

Created on Monday, September 1 2014 by jdmiles

Last modified on Monday, September 1 2014.

Which of the following statements about the neuron action potential is TRUE?

 
        A) It is an all-or-none event
 
        B) It is a self-propagating wave of hyperpolarization
 
        C) Action potentials vary in amplitude from one to the next
 
        D) A neuron can fire over 1,000 action potentials per second
 
        E) An action potential is only able to propagate over a short distance, determined by the length constant
 

 


Back to the question = Go back to the top of the page.
See another question like this one = Reload a different version of this question ().
Click here for a random question = Load a random question from the database.
Clone this question = Use this question as a template to create a totally NEW question.
Rate this question = Enter detailed rating for this question!
Average rating not yet available
= How users like you have rated this question.
This question was created on September 01, 2014 by jdmiles.
This question was last modified on September 01, 2014.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS




A) It is an all-or-none event

This answer is correct.


Action potentials are self-propagating waves of depolarization that travel the entire length of an axon without significantly changing in amplitude. Since they are all-or-none events, the peak amplitude of an action potential does not significantly change form one action potential to the next. The axon membrane needs some time to recover after each action potential, so there is a finite rate at which they can occur. The absolute maximum rate of action potential firing is about 1000 per second, but most neurons have maximum firing rates that are much slower than that.  (See References)

Back to the questionSee another question like this oneClick here for a random questionClone this question Rate this question
Average rating not yet available
Please log in if you want to rate questions.

 

 

 

 

 

 

 

 

 




B) It is a self-propagating wave of hyperpolarization

This answer is incorrect.


Action potentials are self-propagating waves of depolarization that travel the entire length of an axon without significantly changing in amplitude. Since they are all-or-none events, the peak amplitude of an action potential does not significantly change form one action potential to the next. The axon membrane needs some time to recover after each action potential, so there is a finite rate at which they can occur. The absolute maximum rate of action potential firing is about 1000 per second, but most neurons have maximum firing rates that are much slower than that.  (See References)

Back to the questionSee another question like this oneClick here for a random questionClone this question Rate this question
Average rating not yet available
Please log in if you want to rate questions.

 

 

 

 

 

 

 

 

 




C) Action potentials vary in amplitude from one to the next

This answer is incorrect.


Action potentials are self-propagating waves of depolarization that travel the entire length of an axon without significantly changing in amplitude. Since they are all-or-none events, the peak amplitude of an action potential does not significantly change form one action potential to the next. The axon membrane needs some time to recover after each action potential, so there is a finite rate at which they can occur. The absolute maximum rate of action potential firing is about 1000 per second, but most neurons have maximum firing rates that are much slower than that.  (See References)

Back to the questionSee another question like this oneClick here for a random questionClone this question Rate this question
Average rating not yet available
Please log in if you want to rate questions.

 

 

 

 

 

 

 

 

 




D) A neuron can fire over 1,000 action potentials per second

This answer is incorrect.


Action potentials are self-propagating waves of depolarization that travel the entire length of an axon without significantly changing in amplitude. Since they are all-or-none events, the peak amplitude of an action potential does not significantly change form one action potential to the next. The axon membrane needs some time to recover after each action potential, so there is a finite rate at which they can occur. The absolute maximum rate of action potential firing is about 1000 per second, but most neurons have maximum firing rates that are much slower than that.  (See References)

Back to the questionSee another question like this oneClick here for a random questionClone this question Rate this question
Average rating not yet available
Please log in if you want to rate questions.

 

 

 

 

 

 

 

 

 




E) An action potential is only able to propagate over a short distance, determined by the length constant

This answer is incorrect.


Action potentials are self-propagating waves of depolarization that travel the entire length of an axon without significantly changing in amplitude. Since they are all-or-none events, the peak amplitude of an action potential does not significantly change form one action potential to the next. The axon membrane needs some time to recover after each action potential, so there is a finite rate at which they can occur. The absolute maximum rate of action potential firing is about 1000 per second, but most neurons have maximum firing rates that are much slower than that.  (See References)

Back to the questionSee another question like this oneClick here for a random questionClone this question Rate this question
Average rating not yet available
Please log in if you want to rate questions.

 

 

 

 

References:

1. John Nolte; three-dimentional brain reconstructions by John Sundsten. The human brain: an introduction to its functional anatomy. Philadelphia, PA : Mosby/Elsevier, c2009. (ISBN:0323041310)Advertising:
Back to the questionSee another question like this oneClick here for a random questionClone this question Rate this question
Average rating not yet available
Please log in if you want to rate questions.

 

FrontalCortex.com -- Neurology Review Questions -- Neurology Boards -- Board Review -- Residency Inservice Training Exam -- RITE Exam Review
physiology
Neuron Action Potential 2
Question ID: 90114167
Question written by J. Douglas Miles, (C) 2006-2009, all rights reserved.
Created: 09/01/2014
Modified: 09/01/2014
Estimated Permutations: 360

User Comments About This Question:

0 user entries
Please log in if you'd like to add a comment.