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Home Q & A Board Biology-Related Homework Help Anatomy and Physiology
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x-Beth-x x-Beth-x
wrote...
14 years ago
Below is a diagram of an action potential. Choose the label that corresponds to the time in which the axonal membrane’s permeability to Na+ ions is at its peak, while its permeability to K+ ions is at the resting level.

See the attachment file.


A. A
B. B
C. C
D. D
E. E
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wrote...
#1
Educator
14 years ago
C is when the axon is at its maximum depolarization state. Beyond this point, it becomes re-polarized (starts to become negative again).
wrote...
#2
Educator
14 years ago Edited: 14 years ago, bio_man
To elaborate Beth,

the sodium channels close at the peak of the action potential, while potassium continues to leave the cell. The efflux of potassium ions causes a decrease the membrane potential or hyperpolarizes the cell.

Reply back if you need further assistance!
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