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Dillon MCQ 01

Topic: Anatomy

Created on Saturday, November 26 2022 by dillon

Last modified on Saturday, November 26 2022.

Altering the concentration of which of the following ions in the presynaptic cleft will have the greatest, and most direct, impact on neurotransmitter release?

A) Cl-

B) K+

C) Na+

D) Ca++

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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

A) Cl-

This answer is incorrect.

Not a major player in neurotransmitter release (See References)

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B) K+

This answer is incorrect.

K+ is not directly implicated in neurotransmitter release (See References)

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C) Na+

This answer is incorrect.

Na is involved with spreading an action potential but it is not the DIRECT cause of neurotransmitter release (See References)

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D) Ca++

This answer is correct.

Correct, voltage-gated Ca 2+ channels are activated when the AP enters the terminal, resulting in the release of neurotransmitters (See References)

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References:

1. Vanderah, Todd W., and John Nolte. “Ch. 8: Synaptic Transmission Between Neurons.” Nolte's Essentials of the Human Brain, Elsevier, Philadelphia, PA, 2019.

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anatomy
Dillon MCQ 01
Question ID: 112622037
Question written by dillon. (C) FrontalCortex.com 2006-2009, all rights reserved. Created: 11/26/2022
Modified: 11/26/2022
Estimated Permutations: 24