Action Potential - Firing of a Neuron - Depolarization
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- čas přidán 17. 05. 2024
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In this video, Dr. Kushner breaks down an action potential, a brief electrical charge that travels down the axon of a neuron. Consider the different phases to this amazing event:
1. Depolarization (sodium channels open - Na+ rushes in - neuron become more positive - generates an action potential - +30 mV)
2. Repolarization (sodium channels close; potassium channels open - K+ rushes out; neuron rebalances voltage)
3. Hyperpolarization/Refractory period (neuron recharges; -90 mV)
5. Resting potential/state (neuron returns to -70 mV)
wow you deserve the Nobel prize for most clear understanding of an action potential.
Much appreciated 🏆 😀
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It’s all about the mnemonics 😊
@PsychExplained You're doing the LLOYDS work! Keep it up! Looking forward to watching more videos.
This is THE best explanation I've seen of this concept on youtube omg
Thank you 😊
geniunely this is the best video I've seen on action potential. You made it so simple and I really appreciate that.
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Wow, thanks! 🙏🏻
OMG!!! thanks very much for this! I have never commented on any video on CZcams....but i think this video triggers me, it's well explained. THANK AGAIN!!
The best video i have seen so far on action potential thank you so much.
Too kind. Glad it helped 🧠
In physio psychology introductory class best explanation I have ever seen
This video is life-changing 😊! Thanks so much for the detailed drawing and steps!
So happy to help!
After years of reading AP over and and over, watching multiple videos, making notes for 1000th time.. this video finally taught AP without having to mug up😭😭🙌🏼🙌🏼
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Thank you and I would really appreciate if you were to post more.
Appreciate the kind words! It may surprise you but I teach high school AP Psychology. These videos are for you, and helping you earn that 5! Many more to come.
@@PsychExplained 😊
wow I was so confused on action potential and you made it so clear and understanding without using so much terminology! Thank you!!!!!!!!!!!
You're very welcome!
Love this Doc!
Appreciate the message 😇
Amazing Teacher, honestly not only did I learn more about Neurons but I also learned how to teach in a more clear fashion by watching how you explain things
Thank you so much for your kind words!
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Glad it was helpful!
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Thank you for explaining it to me in simple and understandable way
Glad it was helpful!
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Wonderful! Nurses are amazing. Enjoy the journey :)
I love the way that you explain things ! a person who even dose not have science background can totally understand it and that is amazing ! keep spoiling us with your videos
Happy to help! 😎😎
Thank you very much, this is the best video and I now understand the action potential
You are welcome!🙏🏻
Again thanks so much for the detailed yet not overcomplicated explanations. The visuals really help me relate math and science together something I normally struggle with a lot.
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Happy to help 😎
Fantastique! = +-+-+-+-+-+- ... I recently learned that due to a violent upbringing I have premature myelination and four other premature stuff that went on at a microscopic level within me. I was left with axons looking as if they were pumped up on steroids due to development adaptation. This vid has just given the nitty gritty to my external potential. Look out bad world, the Hulk lives. THANK YOU Doc.
Thank you for the very well put explanation. The only thing, however, you didn't mention was the sodium-potassium pump, which is what allows the neuron to return to the resting stage after being hyperpolarized!
Wonderful! Great pick up
Thanks you
You made this easy .
First time to understand it
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Excellent ! Thank you for your clear, clear, and easy explanation. A BIG THANK YOU!
Glad it was helpful!
beter than 2 hrs lecture of my teacher
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Your video in 1.25 speed was the best explanation of this process! Thank you
Glad it was helpful!
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thankx finally somone explained what cause the hypopolarization .
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Wonderful! Thank you for the kind words. Happy learning 🧠 📚 ✏️
You are teaching me also English! Keep going men. Please more on statistics (null hypothesis, regressions) and physiology (muscle function, muscle damage).
More to come!
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Easy to understand - Great
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Happy to help! 😇
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@@daisymarquez7668 check out Siebert Science! He has great videos on these topics.
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Whatt a great explanation finally i understand action potential just one question that in the end after hyperpolarisation do the sodium ions also go back out of the neuron??
Thank you
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So glad it helped!
Please make videos on sensation and perception.
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Welcome 😊
Thanks.
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Why is the voltage at -70 inside at the start? If potassium is positive, what else is in the neuron that's so negative? Great video btw, thank you!
The resting membrane potential of approximately -70 millivolts (mV) inside a neuron at rest is primarily due to the differential distribution of ions across the cell membrane, particularly potassium (K+) and sodium (Na+), as well as the selective permeability of the membrane to these ions.
How don't we have only Na+ inside after several times the nerve is in action? Should be nun out of K+ and only have Na+ left inside the neurone??
Thanks, good explination! But what happens afterward because this time all the K+ is outside and Na+ is inside. The normal position was the opposite (K+ were inside and Na+ were outside).
asking the same question
Potassium channels open in response to depolarization, allowing potassium ions to move out of the cell down their concentration gradient. This efflux of potassium ions helps restore the negative charge inside the cell. Sodium channels that opened during depolarization begin to close, reducing the influx of sodium ions into the cell. This decreases the positive charge inside the cell. As a result of these processes, the ion gradients across the cell membrane gradually return to their resting state, with potassium ions predominantly inside the cell and sodium ions predominantly outside. This restoration of ion gradients allows the neuron to prepare for subsequent action potentials and maintain its resting membrane potential.
these sodium ions are going in and out of the neurons so fast is this Tom and Jerry or something😭
🎯 Key Takeaways for quick navigation:
00:31 *🧠 Understanding Action Potential*
- Action potential defined as a brief electrical charge traveling down a neuron.
- Neuron anatomy overview: soma, dendrites, axon, axon terminal.
- Importance of action potential in neuron communication.
02:23 *🧪 Ion Concentration and Neuronal Resting State*
- Neurons surrounded by ions: sodium and potassium.
- Resting potential of a neuron at -70 millivolts.
- Explanation of the "salty banana" memory technique.
04:01 *⚡️ Excitation and Binding of Neurotransmitters*
- Excitation of neurons by stimuli like neurotransmitters.
- Role of acetylcholine in binding to receptor sites on dendrites.
- Opening of channels for sodium influx upon binding.
06:05 *🎇 Threshold and Action Potential Initiation*
- Explanation of the neuron's firing threshold at -55 millivolts.
- All-or-none principle: neuron fires when threshold reached.
- Activation of voltage-gated sodium channels for action potential initiation.
07:54 *🔥 Depolarization Phase*
- Depolarization: neuron becoming more positive.
- Sodium influx leading to increased positivity inside the neuron.
- Voltage change triggers the action potential.
10:04 *⏳ Repolarization and Hyperpolarization*
- Repolarization phase: closure of sodium channels, opening of potassium channels.
- Potassium efflux causing the neuron to return to negative polarity.
- Hyperpolarization and refractory period before returning to resting potential.
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Is the Refractory period part of the repolorization?
Great question. I would say no. These are separate events.
Order: Resting state --depolarization-Repolarization --hyperpolarization (refractory period).
Repolarization is part of the firing process of a neuron, while the refractory period deals with a neurons ability to generate another action potential.
And how does the potassium come back in and the sodium leave to go back to original resting potential? That bit wasn't mentioned. It sounds like in the end, the charge might be the same, but with hardly any K+ And lots of Na+ compared to first charge
While the sodium-potassium pump helps restore the original ion concentrations, other mechanisms, such as the closing of voltage-gated sodium channels and the opening of potassium leak channels, also contribute to reestablishing the resting membrane potential.
So, the transmission of the action potential is like an electric canon
Sir you explained really well but Kindly tell me why chloride ions didn't play that much role in action potential though they are also present in this process? kindly Explain.
They play a major role at the synaptic bulb (axon terminal). I will touch on this more in my next video on neural transmission ⚡️⚡️⚡️⚡️⚡️
How you get awareness out of this unconscious matter ?
you are so unique please keep it up but i have a question why the + and _ charge interchange and where is the _ charge comes ? both K+ and Na+ are positive how exchange meaning when Na + inter the k+ out HOW ??? i public health student and i want to be know more about this
Hello! Not sure I understand your question - In the case of the sodium-potassium pump, which is essential for maintaining the resting membrane potential of nerve cells and muscle cells, sodium ions (Na+) are pumped out of the cell while potassium ions (K+) are pumped into the cell.
Sir yor explanation of the action potential was very good, but you did not explain how the amount of sodium on the outside and potassium on the inside return to normal.
Repolarization - brings the cell back to resting potential. The inactivation gates of the sodium channels close, stopping the inward rush of positive ions. At the same time, the potassium channels open.
Hi Do you have lecture for ECG basics?
I don’t sorry. Closest thing is talking about EEG in my sleep video 😴
DR.KUSH
Cool
❤
Salty banana was pure genius 🤣
Not bad, but i think u didn't say main point. How can an electrical potential be created if both potassium and sodium have a positive charge? Where does the negative charge come from inside the cell?
I feel like you asked me which came first: chicken 🐔 or the egg 🥚?
I too like this guy...What...salty Bannna!....😂😂😂
진짜 잘가르치네....기말시험 구세주
I dont think its right to put only minus or positive inside the neuron, there is both positive and negative always outside and inside the neuron. Just the amount changees.
This is correct 👍
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