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


Answer: B

Anatomy & Physiology

You might also like to view...

Ovulation occurs in response to the release of an anterior pituitary hormone known as ________ hormone

A) antidiuretic B) thyroid-stimulating C) luteinizing D) follicle-stimulating

Anatomy & Physiology

Which of the following usually accounts for the smallest percentage of leukocytes in a

blood sample? A) Eosinophils B) Basophils C) Monocytes D) Neutrophils

Anatomy & Physiology

Select the item that is not a part of the cytoskeleton

a. inclusions b. intermediate filaments c. microfilaments d. microtubular lattice e. microtubules

Anatomy & Physiology

The __________ muscles of the foot both originate and insert within the foot

A.   intrinsic B.   extrinsic C.   intrinsic and extrinsic

Anatomy & Physiology