The following are the main steps in the generation of an action potential. 1. Sodium channels are inactivated.
2) 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.
The proper sequence of these events is
A) 4, 6, 7, 3, 2, 5, 1
B) 4, 6, 7, 1, 2, 3, 5
C) 5, 7, 4, 1, 2, 3, 5
D) 2, 4, 6, 7, 1, 3, 5
E) 4, 2, 5, 6, 7, 3, 1

Question

Quizplus · Accepted Answer

This sequence follows the proper order of events in an action potential. Graded depolarization brings an area of an excitable membrane to threshold (4), followed by sodium channel activation (6) and sodium ions entering the cell (7). Potassium channels then open, causing potassium to move out of the cell and initiating repolarization (2). Sodium channels then regain their normal properties (3), and a temporary hyperpolarization occurs (5). Finally, sodium channels are inactivated (1).

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