Notes for myself and anyone else interested: - Sodium/ potassium pumps in the axon actively transfer Na+ out of the cell increasing and K+ into the cell. - K+ ions move out of the axon through K+ channels along the concentration gradient - This results in lesser concentrations of positive ions in the axon, making the inside of the axon more negative than the outside - K+ ions are pulled back into the axon due to the electrochemical gradient - The electrochemical and concentration gradients counteract each other and so there is no net movement of K+ - Potential difference of -70mV is maintained, as the inside of the axon is more negative.
2:14 slight mistake The membrane has a potential difference not the entire neurone and the difference in charge is between the inside and outside of the Axon not the entire neurone.
oh my god, thank you so much for this!! I learnt this on wednesday but it went over my head. after watching this video, i understand it now thank you so much miss estruch!
I'm confused! If you continually have more potassium Ions leaving the axon through the channel than you have Potassium ions entering via the pump you would eventually run out of potassium ions inside the axon. The reverse would be true of the sodium ions, you would run out of sodium ions outside the axon. I'm assuming there must be a point when the 2 ions reset themselves. Please explain what I am missing. Thanks!
The Na+ ion channels are voltage-gated, meaning they will open and close when a particular voltage is reached, whereas some of the K+ channels are permanently open. The advantage of this is that it maintains the resting potential.
This would be the same concept. Because there are more potassium ion channels present that remain open potassium ions can diffuse across.. or leak, but the explanation in this video is just a more detailed explanation. Hope that helps
I'm so confused! Please help me understand how the distribution of ions create the resting potential of a neuron? How can I apply this to a real world example? Maybe teen brain science?
Notes for myself and anyone else interested:
- Sodium/ potassium pumps in the axon actively transfer Na+ out of the cell increasing and K+ into the cell.
- K+ ions move out of the axon through K+ channels along the concentration gradient
- This results in lesser concentrations of positive ions in the axon, making the inside of the axon more negative than the outside
- K+ ions are pulled back into the axon due to the electrochemical gradient
- The electrochemical and concentration gradients counteract each other and so there is no net movement of K+
- Potential difference of -70mV is maintained, as the inside of the axon is more negative.
why are you doing this in a youtube comment section 💀
Didnt ask
@@Diorfitzz Fr and on top of that they made several noticeable mistakes
love this, my teacher just taught us this and your video helped me grasp the concepts of the topic even more!
That's great! Really glad the video has helped you
Thank you so much for this clear explanation, was so lost until I found your videos. so glad I have this!!
Hi Lily,
So pleased it's helped clarify this topic for you 😀
Fantastic video, I missed the lesson on this at school. So this was amazing and explained it fabulously
ah amazing ! So pleased it helped you to catch up 😀
2:14 slight mistake
The membrane has a potential difference not the entire neurone and the difference in charge is between the inside and outside of the Axon not the entire neurone.
oh my god, thank you so much for this!! I learnt this on wednesday but it went over my head. after watching this video, i understand it now thank you so much miss estruch!
Great that you put in the effort to research the concept after the lesson to make sure you would understand! Really pleased that it helped 😀
THANK YOU, God bless you. very useful and helpful. didn't really understand it when my teacher taught it
You're so welcome! So pleased it helped you to understand 😀
We love you Miss Estruch❤❤❤😮
ahh thank you
What’s the difference between a generator potential and an action potential? Also does a generator potential lead to an action potential?
Damn , got aired for 2 years
Well done!👍
Thanks!
I'm confused! If you continually have more potassium Ions leaving the axon through the channel than you have Potassium ions entering via the pump you would eventually run out of potassium ions inside the axon. The reverse would be true of the sodium ions, you would run out of sodium ions outside the axon. I'm assuming there must be a point when the 2 ions reset themselves. Please explain what I am missing. Thanks!
hey, yes, there is a Na+/K+ pump that restores it(also restores resting potential)
It was amazing, thank you
You're so welcome
do na+ channels close to maintain resting membrane potential
The Na+ ion channels are voltage-gated, meaning they will open and close when a particular voltage is reached, whereas some of the K+ channels are permanently open. The advantage of this is that it maintains the resting potential.
Hi I was taught that there is a potassium leakage in the membrane that's why more k leaves the cell?. I might just be confused pls clarify
This would be the same concept. Because there are more potassium ion channels present that remain open potassium ions can diffuse across.. or leak, but the explanation in this video is just a more detailed explanation.
Hope that helps
I'm so confused! Please help me understand how the distribution of ions create the resting potential of a neuron? How can I apply this to a real world example? Maybe teen brain science?
More positively charged ions move out of the axon than into it, therefore creating a negatively charged resting potential (-70mV)
can you please upload the powerpoints on your website
Hi,
Thanks for this question.
I am aiming to upload the PowerPoints and notes to the sites over the summer
hello euan banks
Miss Estruch you’re a life saver thank you so much for taking your time and making these videos as they help alot especially to us A2 students.🫀
Thank you!!! I'm so pleased you are finding my videos helpful 🙂