The Following Are the Main Steps in the Generation of an Action

question 65

Multiple Choice

The following are the main steps in the generation of an action potential.
1) Sodium channels are inactivated.
2) Voltage-gated potassium channels open and potassium moves out of the cell, initiating repolarization.
3) Sodium channels regain their normal properties.
4) A graded depolarization brings an area of an excitable membrane to threshold.
5) A temporary hyperpolarization occurs.
6) Sodium channel activation occurs.
7) Sodium ions enter the cell and depolarization occurs.
What is the proper sequence of these events?

• A) 4, 6, 7, 3, 2, 5, 1
• B) 4, 6, 7, 1, 2, 3, 5
• C) 6, 7, 4, 1, 2, 3, 5
• D) 2, 4, 6, 7, 1, 3, 5
• E) 4, 2, 5, 6, 7, 3, 1

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Definitions:

Neurotransmitter

Chemicals that transmit signals across a synapse from one neuron to another, influencing bodily functions such as mood, appetite, and sleep.

Exocytosis

The process by which cells release substances (such as neurotransmitters or hormones) to the exterior through fusion of vesicles with the plasma membrane.

Endocytosis

A cellular process in which substances are brought into the cell by engulfing them in an energy-using process.

Parallel After-discharge Circuit

A circuit configuration in neural networks that involves parallel paths with different lengths that can cause prolonged signal discharge.