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
B
You might also like to view...
Which vertebral bone does NOT have a body?
A) the atlas B) the last lumbar C) the axis D) the last cervical
The release of hormones from the adrenal cortex is stimulated by
A. adrenocorticotropic hormone. B. oxytocin. C. luteinizing hormone. D. antidiuretic hormone. E. thyroid hormone.
Which of the following muscles runs between the larynx and the hyoid bone?
A) digastric B) geniohyoid C) genioglossus D) mylohyoid E) thyrohyoid
The term for false pregnancy is:
A) pseudocytosis B) pseudopregnancy C) pseudoutero D) pseudohysteria