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:

Brain Changes

Alterations in the structure, function, or chemistry of the brain resulting from growth, learning, aging, or exposure to various experiences.

Pituitary

A small, pea-sized gland located at the base of the brain that produces hormones influencing various bodily functions, including growth and reproduction.

Adrenals

Glands located above the kidneys that produce hormones such as adrenaline and cortisol, which regulate stress response and other vital functions.