Dillon MCQ 02

Topic: Anatomy

Created on Saturday, November 26 2022 by dillon

Last modified on Saturday, November 26 2022.

 
        A) K + channels opening
 
        B) Na + channels, opening
 
        C) Voltage gated Ca++ channels opening
 
        D) Delayed K + channel inactivation
 
        E) Inactivation of the Na + channels
 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS

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A) K + channels opening

This answer is incorrect.

This (like the Na channels inactivating) is a part of the repolarization phase   (See References)

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B) Na + channels, opening

This answer is incorrect.

This is the cause of the inital depolarization (upward deflection)   (See References)

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C) Voltage gated Ca++ channels opening

This answer is incorrect.

Ca is not a major player in the classic action potential   (See References)

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D) Delayed K + channel inactivation

This answer is correct.

Correct, The delayed closure of the K channels is what causes the overshoot in repolarization  (See References)

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E) inactivation of the Na + channels

This answer is incorrect.

This marks the beginning of the repolarization phase (downward deflection)  (See References)

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References:

1. Vanderah, Todd W., and John Nolte. “Ch. 7: Electrical Signaling by Neurons” Nolte's Essentials of the Human Brain, Elsevier, Philadelphia, PA, 2019.

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anatomy
Dillon MCQ 02
Question ID: 112622038
Question written by dillon. (C) FrontalCortex.com 2006-2009, all rights reserved. Created: 11/26/2022
Modified: 11/26/2022
Estimated Permutations: 120