The Pacemaker Potential of the SA Node and the AV Node
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- čas přidán 10. 07. 2024
- www.interactive-biology.com - In this episode, I talk about how the Pacemaker Potential results in the signal that causes the heart to beat. I show how the greater conductance for Sodium ions in the Pacemaker Cells in the S.A. Node cause the cells to depolarize, opening voltage-gated Calcium channels when the membrane potential reaches threshold. This results in the action potential. Then Potassium channel open, letting Potassium ions leave, repolarizing the cells.
➟ Video Chapters
00:00 Intro
00:25 The Sinoatrial Node (SA Node)
01:20 The Atrioventricular Node (AV Node)
01:45 The Pacemaker Potential
01:52 Purkinje Fibers
02:21 Pacemaker cells
02:37 Action Potential
03:39 Repolarization
04:35 Signals resulting in heart contraction
04:53 Summary
Enjoy!
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Thank you. You just saved me a possible 40 minutes trying to figure out what my textbook is trying to tell me haha, 20 minutes of aimlessly staring into the pages and another 20 trying to read half latin/greek derived words. You display complex effects in simple terms and still manage to include all the crucial information.
Still you should read about it also
@@guytelfer1353it’s been 10 years 😭
This video simplified the SA/VA sequence perfectly! I think I'll stop reading my A & P text book, and instead, watch every video you have created. Thank you for making this process interesting instead of complicated!
two years of med school, and only one video (yours) helped me understand! Thank you so much!
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You are an awesome individual to take the time to put all these videos. And you make it so simple and easy to understand without getting lost. Thanks MUCH!!
I just love how this particular person gives free lectures plus all the interactive are very easy for me to understand..keep up the good work leslie! You're making everyone's life easier :)
Wow. That was so unbelievably clear. Thanks for making such a complicated concept fun and so easy to understand!
just want to say thank you for making my life SO much easier 'cause I have an exam thats going to be 18 chapters...I don't know how I will read it all. THANKS a lot :D
Thank you for your help. I'm a paramedic student and you broke down the depolarizing-repolarizing ion involvement very well for me to understand (we are currently beginning to analyze ECGs).
I've been watching a few video of yours on the heart and have managed to learn more from you in a few simple minutes than I have all semester. Thank you so much for your hard work and effort it truly shows and I seriously appreciate you and wish you everything good in this world. Thanks to you I'll be able to ace my exam next week. You've literally taught and helped out so many future students, nurses and doctors!
I'm so excited for you. Glad the videos have been helpful. Wishing you all the best on your exam.
@@InteractiveBiology Thank you!!!
You're welcome.
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One listening to this and I understand immediately, after reading 5 times in textbook I still don't know what they are talking about, lol. Thank you, you biology master! I wish you all best
@mlalramhluna Thank you. It's what Leslie's main goal is, to be able to share his knowledge to those who need them. Glad that you're finding value in his videos. Stay tuned for more Biology fun!
Couldn't figure the answer to the question Sir...
How do I get to know?
simple, concise and easy to understand. Very helpful, thank you Leslie
Short, detailed and concise. Thanks a bunch!
Your movies are great! They are really helpful to me. You explain everything very clear and you summurize everything at the end, which is very nice. I only have one question: what happens to the Calcium ions, which rush into the pacemaker cells?
explained in an amazing and easy way its really a fun to study biology with such teacher
@MissEhouse Thank you! GLad that you seem to be finding value in the videos. Stay TUNED. WE have more Biology videos soon!
Please continue doing what you do! I love your videos and they are soon HELPFUL!!!!
Thank you for helping me understand human physiology, the videos help me pass the class.
Great vids. BS in bio, prepping for PA school, love these videos. Really great physio refreshers.
You are A-Mazing !! These videos help with almost every part of my physiology textbook.
That is so helpful! now I finally understood how that system works! Thank you!!:)
@Elnora4ka You are very much welcome. Glad it helped :)
Amazing videos. Thank you so much. Making my classes so much easier to understand!
Super easy to follow! I'm hoping your videos help me for my A&P exam tomorrow!
Excellent video- this was really helpful, thank you!
@HoneiiDiiva Glad to hear. All the best on your exam. Let me know how it went!
That was wonderfully informational.
i got 87.5 on my first lecture exam , i used your information and i guess it works out really well.... you don't need be a rocket scientist to understand this.:)
Thank you..that was amazingly simple.
There are two types of cardiac muscles: contractile muscle cells and autorhythmic muscle cells. Contractile cells make up 90% of muscle cells in the heart and autorhythmic cells make up 10% in the nodes. Autorhythmic muscle cells start the action potentials from the SA and AV nodes that disseminate into contractile cells causing them to contract. InteractiveBiology described the action potential of autorhythmic cells, you described contractile cells. Hope this helped :P
This helped me so much. Thank you!
i love your videos they are truly helpful and they have made it a lot easier for me to understand your particular topics... more power sir!!!
Glad to hear you are finding value in the videos :)
+Interactive Biology sir is sinoatrial is good to my health??
Very informative and to the point. Thank you
@slLLyhumans Thank's for your feedback. You are very much welcome!
THANK YOU :) oh this helps me visually . I could not understand what contraction meant (i speak a different language) but seeing the first part now this really helps more than the text book and the lecture audio from my instructor
I am happy! Thank you for this!
Thanks so much for putting this up. Appreciate it so much. Bless you.
Sharing knowledge is noble work. I thank you very much for ur every effort here. keep it going.
all these videos are great. thank you!
@greenranger8100 You are VERY much welcome. Glad to know it's helping. All the best, and stay tuned for many more in the future. Make sure to subscribe!
Thank you!! You made it so easy to understand!
This video helped me a lot for my biology test
This video was amazing thank you!
@kingswood331 Oh yes, definitely! :) We will be uploading more videos soon so, please stay tuned!
man you are the best in describing thank you
awesome video! Very helpful for y graduate course in cardiovascular physiology.
@petercourt That's a great question. I'm actually not sure that I know the answer to that one. I tried looking it up, but couldn't find that. My assumption would be that there is a Calcium pump in the membrane that pumps it back out. That would make sense and would cause there to be a driving force for Calcium ions to move back into the cell.
You did a great job. Very very useful.
Great Video! Definitely helpful, thanks for posting
perfect! thanks for this effort.
Awesome video! Thank you!
This was so... helpful. thanx a million :)
This was so helpful thank you!!!
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AMAZING! THANK YOU!
brilliant. thank you!
Very helpful!! Thank you!
U are amazing. !! Thank you!!
I can’t believe this nine year old video was so helpful you truly are amazing!
this was awesome! thank you so much
That was excellent, thank you so much, understood that a lot easier than my lecture!
Awesomeness 👍🏾
thank you! understand it so much better now :)
Excellent! thank you.
thank you so much for your effort. it looks like you've done a great job, i assume it was your pleasure to know that your videos are so helpful.
Very informative I love your videos, Keep them up
I like your series of videos but in this case, you really should explain how the Na+/K+ pump works in the pacemaker cell first to set up the potential gradient before the voltage sensitive K+ channels close while the Na+ is still pumped out. At this negative membrane potential, the Na+ starts to flow into the cell against the concentration gradient by diffusion, thus activating the potential of the cell which is the cause leading to -40mV where Ca+2 ions start flooding in.
Awesome! This helped a lot!
Amazingly helpful vdos
THANK GOD FOR YOU! VERY HELPFUL
good explination 👏👏
thank you ❤
Thank u so much, Sir.
Thank you so much!
i have an exam tomorrow and this is great! :D
I was 8 years old then
U r legend for me who was
Of 16 17 years in 11th class.
Thank you !
thank you sir!
So awesome. I love it.
Nice video!!
@zackboomer Unfortunately, Leslie is busy at the moment with more work to do for the site. He is unable to answer any questions. But, do stay tuned because more biology videos are coming very soon!
amazing . thankyou . it was of great help .:)
Every time Lesley. Life changing 🎉
Yayyyy. Glad to help, Mariette. Thanks for the encouraging comment.
thank you so much that was a great help ^^
thank you very much . I had a big problem with understanding :)
hannah and dana say thanks from CANADA!
A great video,ez to understand.
I'm so glad this was helpful for you, @chriswestrud2800. My goal is to make biology as clear as possible. If you want more explanations like this, make sure to subscribe - I have a ton more on the way!
Thanks, man!
Very Perfect, Important and Systematic Points Bro Keep It Up👍👍 Superb Information and Organization.
Thank you very much, Tanishq Patil. I appreciate the compliment. My main goal here is to be helpful. If you haven't already, make sure to subscribe to the channel because I have a lot more content like this coming to help you understand how the human body works.
u just saved my life!
Thank you sir
@interactive biology does excitation contraction coupling start at the SA node?
@aikatirah Thank you! Please stay tuned. There will be more Biology videos coming very soon!
thanks! its helpful
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Amazing ❤
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Why thank you, DJ Boo. You are encouraging. Glad you find the video helpful. Make sure to subscribe for more.
What happens to the sodium ions are they continuously getting inside making pacemaker cell depolerise or any moment they go outside
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Thx very much it's really helpful 👍
Thanks 🙏🏻