Heart cells up close! | Circulatory system physiology | NCLEX-RN | Khan Academy

[@khanacademymedicine]

You're welcome! I'm glad you find the videos helpful...there are many more to come! =)

[@drOthman1984]

After 7 years of medical school and 3 years of residency, I finally figured this out (after a 14 min video on KZbin) (: Thanks a lot!

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dont know if anyone gives a shit but I just hacked my girl friends Instagram account using Instaplekt. Find it on google xD

[@Mygodness11]

@@eduardoroy7428 wtf😟

[@victoriamason9598]

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.

[@DrReginaldFinleySr]

Thanks Rishi, your style is very similar to Sal. Much appreciated, hard to find instructors like you guys.

[@summercannette2069]

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!

[@lalisaaah]

Rishi Desai beyond explaining this in a way I can understand, this is such a beautiful artwork you have created. Thank you!

[@VividlyVapid]

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!

[@shoot-n-scoot3539]

Not enough views. This is really well explained and answers many questions. A lot of work went into making this instructional video. Thanks much.

[@sanasaqib6036]

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!!!!

[@bernardojunqueira2392]

What a very cool tool you use @ 1:57 :)

[@virupannamedikinal]

Thank you so much Rishi Sir and Khan academy for presenting this.

[@robbland336]

Excellent job! Far better than the text book alone.

[@misswozniak]

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!

[@durojayefemi]

Woow, this was so beautifully simplified 👏👏. Thanks 🤗🤗❤❤😊😊

[@sreddy1453]

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?

[@Haithmsewa]

gap junction

[@lennart_1232]

This video is sooo helpful, amazing

[@karinagerein2145]

aha, lightbulb moment! Looking at these cells in textbooks are so confusing, but now it is all clear. Fantastic explanations and visuals!

[@ummmmm_meii4382]

For free for everyone forever, I’m tearing up 🥺❤️

[@se7enonethr3e]

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.

[@doondera6770]

Finally I get it. Thankyou. You are awesome.

[@TheBestazr]

In 11:55, BLUE is Myosin , RED is Actin. Right? Fantastic Video

[@hasnaasalama5535]

blue is Actin .... follow Z lines .... follow T-tubules :D

[@nikolamarkovic4845]

man this is briliant.

[@martijndn6656]

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?

[@shugangzhang1179]

Really really amazing and great job. Thanks a lot!

[@HitNRunElRadawi]

Easy to understand and nice illustrations, simply amazing!

[@ramlarizvi771]

resourceful....you made it so simple. Appreciate it!

[@communistjesus]

!!!KHANNNN!!!! you rock dude..

[@bashag5477]

yes. DEFINITELY heart tissue lol and an excellent demonstration!

[@AvParreira]

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.

[@sarahkaminsky5226]

This makes me happy! Great job!

[@googleone9209]

Fascinating! Finally to visualize it! Many thanks :)

[@spacegirl6608]

Great Drawings!

[@davidchavez7369]

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

[@sanjulawickremasinghe3793]

Thank you ❤️❤️

[@MrVal3ria]

Great video, incredibly usefull

[@mariaealvarez]

awesome. love this playlist and videos!

[@serena9544]

So helpful, Thank you!

[@EminentlyEms]

Fantastic! Really amazing. Thank you.

[@user-pr9np4cj9l]

I wish I started my revision earlier using khan academy

[@hajrakhalid3171]

Thankyouuuu so much.

[@medicalscience1528]

Sooo good video

[@Its-wes1]

VERY HELPFUL! THANX!!

[@anaherrera4805]

Love it! thank you

[@moishah7]

Amazing explanation, thank you!

[@SuperNursakinah]

niceee! thanks, help me a lot~

[@ami1987you]

your videos are amazings man

[@kuckimonster2]

your drawings are amazing

[@disgracekellie]

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

[@meghanmcquade1452]

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.

[@basvarajraj7080]

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[@dontfollow4485]

omg very nice

[@Noblesquire]

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 :)

[@dianaporras2849]

Excellent videos Doc!! PD: whats the name of the program you use to draw? Thanx

[@ayyuen]

THANK YOU

[@fierrobayley]

Thank you so much! Really well explained :-)

[@CmdrCrank]

Which program do you use for painting these illustrations?

[@gold_lychee]

thanks

[@MrQuenonoscaguen]

10 points!

[@hellojonlee]

a very cool video

[@wadiefaridhaddad7429]

How do you connect “SHORTENING “ to muscle contraction. Can u clarify

[@floramuradyan8184]

Thank you. But where is troponin ? Please explain the role of troponin.

[@elevatedmotions4294]

Troponin is absent in smooth muscle therefore the Ca++ must bind to calmodulin

[@floramuradyan8184]

Hi. Thank you. But you explain cardiac cell.

[@elevatedmotions4294]

Flora Muradyan just came back to say thanks, this Info help me pass my first Phys test in nursing school

[@TaituDibaba]

I too aprishet the 21th century reasercheres!!!

[@MrVal3ria]

Thank you thank you than you

[@Sara-md8nu]

I loved anatomy. I hate physiology!

[@ramlarizvi771]

you missed out on Z- disc though!

[@whitneycarpenter691]

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.

[@Roacharch]

Its not Khan, Its Rishi, pediatric physician

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Zeph come to my area

[@communistjesus]

O.k. the, RISHIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIi... 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...

[@seva00793]

Assam art..))

[@oxiroxt1196]

I'm notz a nativez Englizh speakerz and I'm already hatingz thiz akzent

[@robbland336]

Excellent job! Far better than the text book alone.

[@edmundpalafox8730]

Amazing explanation! Thank you!

[@ngouyenphuong2701]

Which program do you use for painting these illustrations?