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Home Q & A Board Biology-Related Homework Help Anatomy and Physiology
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iwanttoknow iwanttoknow
wrote...
13 years ago
My teacher said

understand the concept that the threshold of a neuron is not a constant value of trans membrane potential but more closely related to the charge across the membrane

can you please explain
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wrote...
#1
13 years ago Edited: 13 years ago, JoAnne
This video should explain this concept clearly:



Thus, the threshold is not constant. Instead, it strongly depends on the state of the membrane. This depolarization you're see (going from negative to positive and then back to negative) of an excitable membrane requires flow of electrical charge across the membrane.

If for example the outside is highly positive (recall that neurons are highly permeable), the neuron wouldn't require much for it to reach the threshold (positive value) to initiate an action potential.
Joanne
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