Carley MCQ 02

Topic: Anatomy

Created on Saturday, November 26 2022 by carley

Last modified on Saturday, November 26 2022.

 
        A) During the relative refractory period, it is impossible for another action potential to be generated
 
        B) Refractory periods occur due to the closure of voltage-gated K+ channels
 
        C) Refractory periods prevent action potentials from spreading out in more than one direction
 
        D) Refractory periods last about half the duration of an action potential
 

 

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This question was created on November 26, 2022 by carley.
This question was last modified on November 26, 2022.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS

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A) During the relative refractory period, it is impossible for another action potential to be generated

This answer is incorrect.

During the relative refractory period, another action potential can be generated but it requires a greater than normal activation of Na+ channels   (See References)

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B) Refractory periods occur due to the closure of voltage-gated K+ channels

This answer is incorrect.

K+ channels are still open during this period   (See References)

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C) Refractory periods prevent action potentials from spreading out in more than one direction

This answer is correct.

As an action potential proceeds down an axon, the refractory period that trails behind helps to ensure that it travels in one direction down the axon  (See References)

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D) Refractory periods last about half the duration of an action potential

This answer is incorrect.

Refratory periods are short and last a few milliseconds   (See References)

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References:

1. Nolte, J. (2008). The Human Brain: An Introduction to Its Functional Anatomy, 6th ed. Mosby, St. Louis. (ISBN:0323041310)

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anatomy
Carley MCQ 02
Question ID: 112622002
Question written by carley. (C) FrontalCortex.com 2006-2009, all rights reserved. Created: 11/26/2022
Modified: 11/26/2022
Estimated Permutations: 24