The Depolarization Phase of an Action Potential Is Punctuated by the Closing

question 50

Multiple Choice

The depolarization phase of an action potential is punctuated by the closing of inactivation gates in the voltage gated sodium ion channels. All of the following are consequences of this inactivation except one. Choose the statement below that is not a consequence of the closing of inactivating gates.

• A) This allows for the one way transmission of action potential down the axon.
• B) This allows for the efflux (diffusion out) of potassium ions, resulting in the repolarization of the cell.
• C) This limits the frequency of action potentials down the axon.
• D) This stops the depolarization of the axon membrane.

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Definitions:

Strong Manipulation

The application of a significant change or intervention in an experiment, aiming to produce a noticeable effect on the dependent variable.

Internal Validity

The certainty with which results of an experiment can be attributed to the manipulation of the independent variable rather than to some other, confounding variable.

Ceiling Effect

Failure of a measure to detect a difference because it was too easy (also see floor effect).

Strongest Manipulation

In experimental research, the use of the most extreme or powerful version of the independent variable to assess its effects.