Action potential and neurotransmisor codification

loluislo

wrote...

A year ago

Action potential and neurotransmisor codification

I have learnt that an action potential can be produced by the reception of a neurotransmisor. Is there a direct relationship between an action potential and the release of a concrete neurotransmisor? (for example "this level of voltage leads to the release of acetylcholine, and a higher voltage leads to a different one")

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bio_man

wrote...

Educator

A year ago Edited: A year ago, bio_man

Yes, indeed there is a relationship. Neurons operate on the all or nothing principal, where a certain voltage threshold needs to be reached before an action potential can take place, which then leads to the release of neurotransmitters at the axon terminal.

Please watch these two videos in the order they appear below:

https://videos.homeworkclinic.com/watch/227/the-nerve-impulse/

https://videos.homeworkclinic.com/watch/598/transmission-across-a-synapse/

Feel free to ask further questions!

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loluislo

wrote...

A year ago

Thank you so much. The thing that I don't get is:

1)why does a "stimulus" open a Na+ canal. In fact what is a stimulus?
2)why sometimes the NT released is acetylcholine and other times it's, for example, serotonin

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bio_man

wrote...

Educator

A year ago

Depends on the neuron. Some neurons are activated by touch, some are activated by light, others by chemicals (neurons within your taste receptors found in the tongue)

Again, for question 2, depends on the neuron. Natural evolved different neurotransmitters to prevent a single neurotransmitter from being the main signal.

Sorry for the short response, currently outside 😄 but I hope you get the idea

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