Heart cells up close! | Circulatory system physiology | NCLEX-RN | Khan Academy
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- เผยแพร่เมื่อ 13 ต.ค. 2024
- Get a close-up view of the cardiac cells and see what makes them different from the other (skeletal and smooth) muscle cells. Rishi is a pediatric infectious disease physician and works at Khan Academy. Created by Rishi Desai.
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You're welcome! I'm glad you find the videos helpful...there are many more to come! =)
After 7 years of medical school and 3 years of residency, I finally figured this out (after a 14 min video on TH-cam) (:
Thanks a lot!
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I'm also a user of the khan academy website, and I swear you are the BEST teacher. I learn more from these videos than I could ever learn from my professors lectures and power points.
Thanks Rishi, your style is very similar to Sal. Much appreciated, hard to find instructors like you guys.
spent all afternoon watching your videos.. you explain it in a way that i can FINALLY understand. You are a wonderful teacher! Thank you for your time in making these!
Thank you so much Rishi Sir and Khan academy for presenting this.
Rishi Desai beyond explaining this in a way I can understand, this is such a beautiful artwork you have created. Thank you!
Woow, this was so beautifully simplified 👏👏.
Thanks 🤗🤗❤❤😊😊
Omg i love you!!!! You've made it soo easy!!! I was never able to understand it in med school. But now prepping for my residency i finally do. Amazing job!!!!
I've been struggling to grasp this structural concept for an hour or so from my book and notes and this completely explained all I need to know so easily and throughly. Thank you so much!
Not enough views. This is really well explained and answers many questions. A lot of work went into making this instructional video. Thanks much.
yes. DEFINITELY heart tissue lol
and an excellent demonstration!
This video is sooo helpful, amazing
Really really amazing and great job. Thanks a lot!
resourceful....you made it so simple. Appreciate it!
Finally I get it. Thankyou. You are awesome.
Excellent job! Far better than the text book alone.
Lol I loved it.. Wish I knew about this atban early age. I had a vision about this and I never knew what life really is. I see it as steady growth and about visions and our wildest dreams are going to come true because we are our vision we are our light our energy. We are, even when I refer as myself there I used the word we because with one is within. But thanks to science we've disocoverd a way to live eternally.
great video, very well explained, I usually go to Khan academy for my reviews...one thing though, you failed to mention, z discs, I bands, and A bands. i don't know what those are but i have them in my study guide so i know their related to the topic
aha, lightbulb moment! Looking at these cells in textbooks are so confusing, but now it is all clear. Fantastic explanations and visuals!
man this is briliant.
When the calcium is released from the sarcoplasmic reticulum what keeps it from binding the junctin/ryanodine/triadin receptor and perpetuating more Ca2+ release and muscle contraction?
gap junction
Easy to understand and nice illustrations, simply amazing!
I wish I had more time to watch all your videos before my exam this week!!! I regret that I didn't find your channel earlier! Many thanks and have a Happy New Year!
Great Drawings!
Brilliant! Thank you so much for this presentation. I think its awesome that people like you put this stuff out there for people like me in A&P to utilize. Very grateful. Ex-CELL-ent job :)
Fascinating! Finally to visualize it! Many thanks :)
Great video, though I have one question: If a cardiac muscle cell gets activated by a neuron(for example a neuron from the AV node) through the T-tubule, what role do the other T-tubules from the other cardiac muscle cells have, assuming that the pulse goes through the gap junctions and activates the other cardiac muscle cells? In other words, how do the gap junctions and T-tubules relate/work together?
For free for everyone forever, I’m tearing up 🥺❤️
Great video, incredibly usefull
Amazing explanation! Thank you!
So helpful, Thank you!
What a very cool tool you use @ 1:57 :)
I wish I started my revision earlier using khan academy
Thank you ❤️❤️
Thankyouuuu so much.
This makes me happy! Great job!
Love it! thank you
Thank you so much! Really well explained :-)
In 11:55, BLUE is Myosin , RED is Actin. Right?
Fantastic Video
blue is Actin .... follow Z lines .... follow T-tubules :D
Sooo good video
VERY HELPFUL! THANX!!
awesome. love this playlist and videos!
thanks
Fantastic! Really amazing. Thank you.
I'm confused, How does this work with regards to an Action potential? You explain in your video of "Role of the Sarcoplasmic Reticulum in Muscle Cells" that its the Na+ channels that are opened up during the Muscles action potential causes the "protein complex" (using Ryanodine) that triggers the S.R to dump its Ca+. So my confusion is: Is it absorption of Ca+ into each Cardiac cell's SR that triggers the contraction (by binding to Troponin which shifts Tropomyosin) or the Action potential triggered by the flood of Na+ ions causing Depolarization that causes Ca+ to be dumped into the cell.
Thank you so much! I was really confused about this before but this video made it really clear. I really appreciate it. You got me one tiny step closer to my nursing degree.
The sarcoplasmic reticulum stores few calcium ions, so most of the calcium ions must come from outside the cells. The result is a slower onset of contraction. Your video seems to say that SR has LOTS and triggered by a little? Explain this point please
A small amount of Ca2+ from outside the cell diffuses down its electrochemical gradient into the cytoplasm of the cell (which has a super low concentration of Ca2+ at rest) and then binds to the RyR2 channel in the SR which allows the RyR2 channel to open and the Ca2+ ions inside the SR (which contains a really high concentration of Ca2+ ions relative to the cytoplasm) to diffuse down their concentration gradient from the SR into the cytoplasm of the cell and bind to troponin. Most of the Ca2+ that causes contraction comes from the SR, not from outside the cell. Let me know if this makes sense and if not I can explain it differently.
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THANK YOU
!!!KHANNNN!!!! you rock dude..
your drawings are amazing
Thank you. But where is troponin ? Please explain the role of troponin.
Troponin is absent in smooth muscle therefore the Ca++ must bind to calmodulin
Hi. Thank you. But you explain cardiac cell.
Flora Muradyan just came back to say thanks, this Info help me pass my first Phys test in nursing school
omg very nice
your videos are amazings man
niceee! thanks, help me a lot~
Which program do you use for painting these illustrations?
Excellent videos Doc!!
PD: whats the name of the program you use to draw?
Thanx
a very cool video
10 points!
How do you connect “SHORTENING “ to muscle contraction. Can u clarify
Thank you thank you than you
you missed out on Z- disc though!
I loved anatomy. I hate physiology!
Zeph come to my area
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SPASIVA :O)..
There is a science fiction movie series called Star Trek,,, In one of these movies, the villain's name is KHAN..The hero gets so angry with khan that he shouts his name out loud !!!!!KHANNNN!!!. So being that this man youtube account KhanAcademyMedicine...It 's a NERD type of Joke...
Its not Khan, Its Rishi, pediatric physician
Assam art..))
I'm notz a nativez Englizh speakerz and I'm already hatingz thiz akzent
Excellent job! Far better than the text book alone.
Amazing explanation, thank you!
Which program do you use for painting these illustrations?