The Pacemaker of the Heart - SA and AV Nodes Made EASY!

In this video, I talk about the pacemaker potential of the heart. We're going to dig into the SA and AV Nodes, how they work, and what happens when things go wrong. Check it out and enjoy!
Time Stamps:
00:00 Intro
00:22 SA Node
01:11 AV Node
01:47 Bundle of His to Purkinje
02:10 Conducting Electricity
02:32 Pacemaker Potential
03:09 Sodium ions
03:58 Calcium ions
04:51 Potassium ions
05:38 Pacemaker Potential Review
06:40 Redistribution of ions
07:38 SA Node Problems
08:52 Question

[@cassball7]

I’m in Pharmacy school and this helped me a lot! From on Caribbean person to another THANK YOU! God bless

[@InteractiveBiology]

I'm so glad you found it helpful, @cassball7. You are welcome. 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. 🇸🇽

[@kaylacote5376]

You are a life-saver! Your enthusiasm sparks my interest and has been the key to my understanding of human physiology this semester. Thank you!!

[@InteractiveBiology]

Wow, Kayla. I'm so glad to hear that. You are very much welcome. Let's keep that enthusiasm going 😃

[@Anthony-qp5hb]

right when i was googling how potassium gets back in, my man here was one step ahead!!

[@itsjoychioma]

this has been a LIFE SAVER thank you so much!!! love the fun and light personality it really helps learning a dense class like A&P!!

[@martha36077]

Am so glad I found this channel, grabbing it all at once more than I expected. Thanks so much 🤝🤝🤝.

[@InteractiveBiology]

I'm so glad you found it too. Stay tuned for more.

[@user-sz5dt9ih7f]

Absolutely wonderful video. Thank you, sir!!!

[@yoladidier6000]

I just love these videos. It brings the learning home in a dynamic way.

[@InteractiveBiology]

I'm so glad to hear that, Yola. You're very encouraging and I appreciate you.

[@user-cr8ej2co6i]

Thank you so much. I have been following your videos since yesterday. I hope to watch more of your videos ❤️❤️

[@horcadanielap.4507]

Thanks for making it easier to understand!

[@joyezumah6887]

Very interesting method of teaching.

[@vs650]

Very good video Leslie. Easy to understand and with good expanation. Good luck with your project.

[@InteractiveBiology]

Thanks so much. I appreciate the encouragement.

[@cherylwiest8190]

Your videos are educational and much more interesting than the typical biology videos. Your unique presentation style helps me to remember more details. Best of luck with your Project 30 challenge.

[@InteractiveBiology]

Thanks for the encouragement, Cheryl. I appreciate it.

[@christinacline4432]

Great videos. I've been watching your videos for a long time. Great work.

[@InteractiveBiology]

Thanks, Christina. I appreciate you very much. Thanks for sticking around for so long 😃

[@ednar.arguelles7187]

Love Your Videos❤ Wishing You all the best in this project 🎉🎉🎉

[@InteractiveBiology]

Thanks, Edna. I appreciate you.

[@user-wr1tc3nb2q]

i have been panicking for so long thank god i found this video. thanks a lot sir

[@samaMohamed54823]

عظمة ع عظمة ي خالي ❤🎉

[@kaylagrant1134]

Awesome video! I am in veterinary school right now and this is making things 10 times clearer. Thanks so much!!

[@InteractiveBiology]

I'm so glad you found it helpful, @kaylagrant1134. You are welcome. 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.

[@mikailastromer3722]

Thank you Leslie, excellent video. My midterm for anatomy and physiology is tomorrow and I’m so nervous however your Cardiovascular videos have been a life saver. Much love from PNW❤

[@InteractiveBiology]

Yayyy. I'm so glad to hear that. All the best on your midterm, Mikaila. Let me know how it goes 👍🏾. And 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.

[@mikailastromer3722]

@@InteractiveBiology Hi Leslie! I got an A on my test thank you so much. I love your videos I subscribed and sent your channel to my whole class. Thanks again.

[@InteractiveBiology]

WOOHOOOO.. Congrats on your A. You put in the work and you earned it. Glad to have been a part of the journey 👍🏾🥳🙌🏾

[@shushanikbabayan5207]

Great videos . Thank you

[@InteractiveBiology]

You're very much welcome. Shushanik. 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.

[@shurveersingh7381]

Nice vedio with a lots of information.. great keep it up 👍

[@InteractiveBiology]

You are very much welcome @shurveer singh. 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 👍🏽.

[@zoyaanjum4344]

Thank youu sir ❤ You are a great teacher

[@InteractiveBiology]

I'm so glad you found it helpful, Zoya Anjum. You are welcome. 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.

[@cammiesuelovesyou]

LOVE how u tell us its easy :)

[@InteractiveBiology]

I'm so glad to hear that, Cameron. 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.

[@arundhiman6165]

Hey Cammie

[@johnsonnneoma.]

Your lesson videos are interesting 👍👍

[@InteractiveBiology]

Thanks again, Nnoema

[@samuelrex5174]

Man this is amazing.

[@InteractiveBiology]

Thank you very much, Samuel Rex. 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.

[@sindirodriguez1030]

I should have watched this when I was in BIOL 224. Sodium in, calcium in potassium out….you made it simple!

[@InteractiveBiology]

Better late than never 😉. Glad you got value from it. Stay tuned for many more.

[@user-nr5xt6fk9s]

This is amazing

[@InteractiveBiology]

Thanks, Mkandawire Bright. Glad you found value in 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.

[@mishe4789]

Youre going to save my behind ! ❤

[@InteractiveBiology]

I love saving behinds. Behinds need to be saved 🤣

[@vedh9099]

Extraordinary explanation my dear friend.. Request you to make a video on how depolarization initiates the contraction of cardio myocytes and underlying mechanisms

[@InteractiveBiology]

Here's a video I did on that topic - kzbin.info/www/bejne/Y5fcm3WZfMqnpZY

[@pedromoose8860]

Really excellent video! I have no medical background beyond First Aid - but this is so clear and filled with enthusiasm! So when we sleep our heart rate slows (right?) - I am thinking that something must slow this ion transfer across the membrane. It seems that the absorption of Na by SA cells starts this whole process so perhaps something is slowing that down? (but of course I assume that if any channel experienced resistance then the whole signal-generation process would slow) No? OK - what is the answer? :)

[@InteractiveBiology]

Thanks Pedro. Glad you found the video helpful. You're on the right track. When we sleep, our body's overall metabolic demand decreases and our heart rate tends to slow down. The autonomic nervous system, specifically the parasympathetic part, becomes more dominant during sleep. This leads to the release of neurotransmitters that can reduce the rate of sodium (Na) and calcium (Ca) influx into the SA node cells, which slows down the pacemaker potential. While the ion channels play an important role, the overall regulation is a complex interplay of hormones, neurotransmitters, and intrinsic cardiac mechanisms. Keep up the curiosity, and thanks for engaging with the content! 😊

[@heerkhan1368]

Thanks😊.

[@InteractiveBiology]

I'm so glad you found it helpful, HB. You are welcome. 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.

[@tabithamungai2698]

Thank you

[@InteractiveBiology]

You are very much welcome, Tabitha. Thanks for always being so kind 👍🏾

[@anukitchen7807]

Well why wouldn’t our college professors doesn’t teach like this..I only passed because I found your videos ❤❤you are life savior

[@InteractiveBiology]

Yayyy. Glad to hear you're passing thanks to the videos. That's awesome. Stay tuned for many more.

[@Lumeone]

Good info. It would help if this all was presented and said with calmer emotional charge. Cool, man.

[@InteractiveBiology]

What you're basically suggesting is for me to be someone other than myself. That doesn't work for me, lol. And if you think this is emotionally charged, trust me - I get much "worse" than this. It's just who I am. Some like it. Others don't. Both are perfectly fine as there are MANY other biology teachers on KZbin. You get to choose who you resonate with 😃

[@elinenajim9790]

Watching this while smiling 😊😊😊cause I see myself understanding with ease , sodium in , calcium in, potassium out 😂interesting

[@InteractiveBiology]

That's so awesome to hear, Eline. I'm happy for you. Yep - sodium in, calcium in, potassium out. You've got this. 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.

[@xaviersmith132]

sir you always make biology easy as in this video you explain the pacemaker of heart making it easy to understand.

[@InteractiveBiology]

Thanks Xavier.

[@user-bv1oy6dy8q]

Perfect

[@InteractiveBiology]

Thanks

[@Caroline-pb8xx]

thank you so much

[@InteractiveBiology]

You are very much welcome @Caroline. 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 👍🏽.

[@Caroline-pb8xx]

subscribed! @@InteractiveBiology

[@InteractiveBiology]

Yayyyy 🙌🏾

[@Anthony-qp5hb]

I want to guess that when we sleep the sodium ions flow slower and the heart rate goes down?

[@srinivasvellore447]

During high intensity workouts or high stress activities, probably brain sends signals to create more sodium and potassium ions and this results in increased exchange of these ions through the membrane pumps and that would result in increase in the frequency of depolarization and heart beats faster, resulting in increasing supply of oxygen through blood to the muscle cells! Please correct me if I am wrong.

[@InteractiveBiology]

Now that's a great question! Here's how it works. In high-intensity workouts, it's not really about creating more sodium and potassium ions, but rather how these ions are used. Sodium and potassium ions are always around. But the brain and hormones like adrenaline increase the heart rate by speeding up the electrical signals in the heart's pacemaker (SA node). This causes a faster depolarization, making the heart beat quicker to pump more oxygen-rich blood to muscles. The body is A-MAZING like that! Hope that helps. Also, 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.

[@srinivasvellore447]

​@@InteractiveBiologythanks for your response. But how does adrenaline increase the SA node to increase the rate at which it fires faster!

[@vincenttelfer4206]

being the average lifespan of a rbc how many times would 1 rbc circulate through the entire system? consider the size and distance it would take to travel through the varying current and with the parallel current of other systems partitioned by membranes along with mechanical currents created autonomiclly, consider rbc's expanding and contracting inhibited by vasal constriction , a mechanism of reproduction , speed of the blood varies for example comparing a human hour to a ant hour or a human to Jupiter

[@InteractiveBiology]

This sounds like a homework question. Are you trying to get me to do your homework? 😉

[@vincenttelfer4206]

@@InteractiveBiology nice, just a thought, there's more to rbc's than we recognize

[@vincenttelfer4206]

@@InteractiveBiology it would be a good topic for a new video? helps bring out new questions. consider the distance from the start of the bloodstream circulation back to the start either right or left atrium with the length and BP pumping blood through along with the restriction of the BP in organs and cavernosomes(cavities, bones and cortex's), possible glands restrict vessels, the distance a rbc travels with less pressure would take longer considering its size to get across the distance of a organ

[@vincenttelfer4206]

@@InteractiveBiology , possible there's a blanket for the capillary bed or a capillary blanket surrounds a gland, having a capillary bed in the bowman's capsule where the dermis or cortex of the bowman's capsule being a blanket of vessels , 2 different efferent arteries and vessels the arteries leading to the heart 1st that travel through the pericardium 2nd that efferent into r. atrium with 2 currents speeding up and slowing down rbc's in slow motion and change in current, or no capillary bed under the blanket(membrane) of vessels( barrier)

[@guytelfer1353]

@Vincent Telfer possible the dermis is a capillary blanket with the bloodstream vessels in the hypodermis

[@Shnikey]

Just got your email, Leslie! You can do it! 😊 Thanks for your great content.

[@InteractiveBiology]

Thanks, KB 😃👍🏾

[@chichidaniels2677]

You can literally make a 5 year old understand the most complex concepts

[@allinall2828]

I think while we are sleeping the brain can regulate our heart beat because we don't need more oxygen supply to our muscles Is that correct sir ?

[@InteractiveBiology]

Hi there. During sleep, our brain does regulate a slower heart rate, but it's not just because our muscles need less oxygen. It's part of a natural decrease in metabolism and an increase in the restful activity of the parasympathetic nervous system, which conserves energy and helps the body to rest. Hope that helps.

[@teesand4771]

Can you please talk about the reproductive system?

[@InteractiveBiology]

I definitely will. Stay tuned.

[@CDricka]

Extraordinary achievement; I’m so grateful I found this KZbin: thank you 🙏🏾 for your contribution to science 🧪