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  • Thanks for your simplistic explanation of biological/physiological terms, diagrams, and functional importance! All of these videos helped get me through college level human physiology!

  • tyvm this was very helpful!

    @MrKitrid that can occur if there is way too much Vit D too

  • thx. this really helped me out!

  • Does this mean you can get muscle atrophy from insufficient calcium?

  • @MrKitridim not sure but ivr read calcium supplementation can increse hypertrophy

  • You just saved my Anatomy and Physiology exam grade.

  • Amazing...Thank you!!!

  • Great video, thank you sir!

  • YEAP I just had a simple slide to study on and on thursday I'll have an exam on this. In this depressed moment, I prayed and god let me find your videos to me. Thank you!

  • Ive never felt more stupid.

  • fantastic! well spoken in easy to understand terms.  Love it!

  • khan academy i want to make love to u so bad, i have an exam tomorrow and i knew nothing about this, the teacher explained it to me but it just went out my head, i can only learn from videos which make stuff interesting so thank u so fricken much

  • good video though nonetheless thanks for uploading

  • the way you say troponin kinda bothers me...

  • Thank you for all the videos you posted on muscle mechanisms, I believe you saved my life in my Animal Physiology class!

  • Great video! What an amazing machine!!

  • once again, thank you for helping me get through college!!

  • i need it for sports!-.-

  • The troponin has three subunits, Troponin T, Troponin I, and Troponin C. Troponin T binds to tropomyosin as well as to the other two troponin components. Troponin I inhibits the

    F-actin-myosin interaction and also binds to the other

    components of troponin. Troponin C is a calcium-

    binding polypeptide that is structurally and functionally

    analogous to calmodulin, an important calcium-

    binding protein widely distributed in nature. (Harper's Illustrated Biochemistry, 26th edition, 2003)

  • Thanks babes :) x

  • wow. thank you so much!

  • thanks alot for this video, now i understand this 100% ! 5/5

    exam next week from 80 muscles , insertio and origo, action and all that yay -.-

  • thanks for these videos

    i've got an ap test coming up and this is really helping :)

  • @spinnyteacups mee too!

  • thank you for this video!! finally understand this now

  • i am pretty sure this essay last year got me the 4 on the test. i wrote everything i knew , it covered the 3 pages provided. this will help, learn it well people.

  • You spelled Troponin wrong on your Title

  • thnxzz sallu =]

  • emazinggg

  • genius

  • how can one person possibly know all that stuff??

  • I wonder that myself.

  • @AlexMeier83 it's actually not that complicated

  • @AlexMeier83 everytime i watch one of these amazing videos i think the exact same thing!

  • @AlexMeier83 hes from stanford isn't he?

  • @AlexMeier83 wondering too

  • that differentiates you from the rest of the world my friend. so i encourage you know the stuff. dont be like the rest of the world. some people are very unfortunate and they dont even get the chance to look at videos like this even if they want to.

    when i click on this video and as soon as i see "khanacademy" i was like YES! he does a good job explaining things.

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