The Pacemaker Potential of the SA Node and the AV Node
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- Опубликовано: 31 июл 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!
You save my life. I'm a working child and I end up missing a lot of class so these videos really really help me. Plus, you make things easy to understand and give a reason for everything which in turn makes it super easy to follow.
@MissEhouse Thank you! GLad that you seem to be finding value in the videos. Stay TUNED. WE have more Biology videos soon!
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!
@zamirahbasher All questions are answered in the Interactive Biology community forums from now on. Go to the website in the description and then visit the community. This is to make it as efficient as possible as we have multiple people over there to help answer questions.
All the best
All these videos are great. Please keep them coming. You are making learning a lot easier!
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?
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
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.
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.
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).
simple, concise and easy to understand. Very helpful, thank you Leslie
@gullwings18 Thank you! Stay tuned for more Biology videos coming very soon!
Thank youuuuu for making it simple and short! Awesome for cramming!
Short, detailed and concise. Thanks a bunch!
You are A-Mazing !! These videos help with almost every part of my physiology textbook.
Great vids. BS in bio, prepping for PA school, love these videos. Really great physio refreshers.
explained in an amazing and easy way its really a fun to study biology with such teacher
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
Super easy to follow! I'm hoping your videos help me for my A&P exam tomorrow!
@aikatirah Thank you! Please stay tuned. There will be more Biology videos coming very soon!
Sharing knowledge is noble work. I thank you very much for ur every effort here. keep it going.
Amazing videos. Thank you so much. Making my classes so much easier to understand!
Excellent video- this was really helpful, 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!
@Elnora4ka You are very much welcome. Glad it helped :)
@kingswood331 Oh yes, definitely! :) We will be uploading more videos soon so, please stay tuned!
That was wonderfully informational.
Very informative and to the point. Thank you
@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?
That is so helpful! now I finally understood how that system works! Thank you!!:)
This helped me so much. Thank you!
@tiarafazlin17 I LOVE saving lives with Biology :D - Stay tuned for MANY more, and make sure to share the site with EVERYONE you know who might benefit ;)
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??
Thank you!! You made it so easy to understand!
all these videos are great. thank you!
Thanks so much for putting this up. Appreciate it so much. Bless you.
You did a great job. Very very useful.
@slLLyhumans Thank's for your feedback. You are very much welcome!
Thank you..that was amazingly simple.
This video was amazing thank you!
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.:)
@HoneiiDiiva Glad to hear. All the best on your exam. Let me know how it went!
@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!
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
Great Video! Definitely helpful, thanks for posting
awesome video! Very helpful for y graduate course in cardiovascular physiology.
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.
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Great video , thank you !
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perfect! thanks for this effort.
This was so... helpful. thanx a million :)
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Very helpful!! Thank you!
Awesome! This helped a lot!
This video helped me a lot for my biology test
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
So awesome. I love it.
Nice video!!
brilliant. thank you!
Amazingly helpful vdos
@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.
good explination 👏👏
thank you ❤
thank you! understand it so much better now :)
Excellent! thank you.
amazing . thankyou . it was of great help .:)
THANK GOD FOR YOU! VERY HELPFUL
AMAZING! THANK YOU!
Thank u so much, Sir.
U are amazing. !! Thank you!!
That was excellent, thank you so much, understood that a lot easier than my lecture!
Awesomeness 👍🏾
I can’t believe this nine year old video was so helpful you truly are amazing!
u just saved my life!
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!
thank you very much . I had a big problem with understanding :)
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.
Thank you so much!
thank you so much that was a great help ^^
Great video, thank you very much
You are very much welcome @@aha8131. Glad you got value from it. 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 👍🏽.
Thank you , Really helpful keep going
Thank You so much Sir
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.
hannah and dana say thanks from CANADA!
Thx very much it's really helpful 👍
Thanks, man!
Thank you !
thanks! its helpful
thank you sir!
great video, possible when the levels of serem in the r. atrium reach a point bridging the av node with the sa node , crossing the terminals with a temporary disconnect or a bigger pathway for current a spark(ark) is generated when on disconnect, possibly a gas is released by the nodes into the upper level of r. atrium when the level of rbc's reaches a high level point creates a bridge between the nodes igniting the gas creating combustion, can you measure concentrations in r. atrium
Amazing ❤
What happens to the sodium ions are they continuously getting inside making pacemaker cell depolerise or any moment they go outside
i read in a book that SA node produce action potential without stimulation.
how is it possible?
can any one answer me?
Every time Lesley. Life changing 🎉
Yayyyy. Glad to help, Mariette. Thanks for the encouraging comment.