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

question 197

Multiple Choice

The following are the main steps in the generation of an action potential:
1) sodium channels are inactivated
2) more voltage-regulated 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 further depolarization occurs
The proper sequence of these events is

• A) 4, 6, 7, 3, 2, 5, 1.
• B) 4, 6, 7, 1, 2, 5, 3.
• 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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