Musculoskeletal System | Muscle Mechanics | Multiple Motor Unit Summation

[@helenhamilton7500]

I can`t believe that I actually enjoyed this lesson, you make studying go so smooth. My native language is not english, yet I understand you better than I understand my professors. THANK YOU!

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Hey guys, they have a go fund me page in the description box of newer videos. Let’s go help them so they can keep working on these amazing videos. He helps me more than the professor and I don’t EVEN want to think about how much I pay for school.

[@LUX711]

Vincenzo 😤👋🏼💥 next time _have Zack’s money Ready_

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Finished watching both the part of videos and made my notes... you are one of the best tutor I have came across.. thank you soo much :)

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You guys are doing the world a huge service. Your videos are amazing, and actually interesting to watch. And I learn so easily via them.

[@khanyabangani]

your explanations are honestly great. thank the universe for people like you.

[@sophielin9340]

I've watched the entire video and this is so helpful for my incoming exam!! Very well explained and informative!! Cant thank more for posting this video :)

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+Sophie Lin You can Thank us more by subscribing and telling your friends! Thank you so much for commenting and good luck Sophie!

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Aha already subscribed! and will do so telling my friends :)

[@AkremKShemsu]

For real. I not exagerrating you are the best teacher I have ever learnt with

[@Athandatu]

Vincenzo had a higher recruitment of motor units coming.

[@robbarker4214]

😂👋🏼

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I'm watching from Turkey. You are the best. I'm grateful.

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mezun olmuşsun herhalde :D

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Moral of the story: DONT owe Zach any money.! XD

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[@wendymikkil2043]

You sir, saved my life! I wish you were my professor, you explain everything thoroughly and clearly- can't thank you enough for that.

[@TheMozart79]

You're a lifesaver! Thanks for the excellent videos and clear explanations!

[@godwindabere1677]

Thank you very much. Your path shall shine brighter and brighter unto the perfect day

[@leahsusbilla4815]

Your lecture on muscle physiology helped me have a clearer understanding on motor units and what a strong and weak contraction looks like. Not being able to be in class and the online lectures provided by my instructor, its difficult to learn as I cannot see the person teaching. Being able to see you demonstrate what each concept looks like as a whole, its very helpful for me. Thank you!

[@55rahulyadav24]

Same here

[@ashishpriyadarshi6636]

Very helpful.Can’t fathom how come you are not a celebrity already.Thanks guys.

[@بشرىب-ث3ص]

Wow ..... just wow , good job ninja nerd team you’re the best I swear

[@jeelsalot535]

Youu are god for students like me!!!❤❤ Thank youuuu so muchhhhhhhhhhh l literally enjoy study from your vidio lecture

[@LorindaJeanMD]

Thank you for part 1 and 2!!!

[@madeehaiflah795]

Sir thank u for building the concepts strong and making easy ❣️

[@shashank44763]

no words are enough to thank you sir.

[@Fatima-kq6xg]

You must be our hero😭♥️♥️

[@sonjahudak3848]

You are awsoooome, profesors at my university should learn how to teach from you 😊😊😍❤❤

[@hendheikal7101]

you have such a great teaching style. Thank you so much! Great explanation

[@riyanbabar8416]

Phenomenal lecture 👌 👏 🙌 Thank you so much ❤

[@Yousefmmohammed]

Thank u so much for explaining it in such a really amazing interactive manner 😊👍👏👏👏👏👏👏👏👏👍👏👏👏👏👏👏👏👏👏

[@Nanayaw5740]

Loved that scenario used in the explanation of motor unit recruitment at 13:50😂

[@dankdogger]

You're very helpful my guy, but can we get an F for Vincenzo because my boy got slapped for not bringing the money?

[@Radiating_beauty]

You are AMAZING!! Thank you

[@fatimaemad4029]

Thank you very much, it's really make sense 💜

[@satyamshukla7108]

thank you for making it easier

[@swiftiegirl3037]

thanks for your great efforts, it was so helpful. :)

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Appreciated that we watch your videos? Bro i love you so much for real without you my exams would be pure failures. You are the best for real! Subscribed to your website too!!!! Much love brother

[@wahidsadik622]

Excellent explanations you provided in this video. Thanks

[@hirahammad1039]

Amazing explanation.

[@hamedyhamedy5923]

You are incredible👏👏. Thank you so much. ❤️☺️

[@trudyng1571]

Awesome explanation - thank you.

[@yonastolosa7196]

excellent teaching ability and commitment!!

[@bzgamingmom7879]

Poor Vensesho lol...great video, great explanation and you had me balling with Vensesho lol.. I watched the entire video and it was awesome :)

[@mohamadyounes5472]

Very easy explanation, thanks!!! ❤️❤️❤️

[@neurosurgerypassion2139]

thnx ninja nerd...pls some videos in microbiology

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Thank you so much, Jarur, Murshidabad WB India🇮🇳.

[@nimmraiftikhar1336]

Great Job Done.

[@rabiamaham473]

Your videos are really awesome

[@neurosurgeonmja]

Love you Zach.

[@_infinity_8z]

master at work

[@LilyGraceySa]

Vincenzo, buddie, just give him back his money.😂 Thank you, Zach, great as usual. ❤

[@resblue5388]

that awkward moment when you're the lab nerd he describes XD. Thanks so much for the video!!!

[@aryaj1046]

I watched both videos... Very helpful.. Thanks

[@tanayjoshi6407]

Thanks a lot a sir !!!!🙏🙏

[@shivchandrasahu5119]

you are great sir love from india

[@teamammcri2224]

Made a lot of sense👍

[@zeez_art]

I just can say thank you.

[@science4827]

How the strength of the neural stimulus can differ while the action potential is always the same as it follows (all or non law ) ??!

[@hareshbro6803]

Hi I had the same doubt but u can see he explained The strength of stimuli concept by using a muscle (not muscle fibre -All or none law applicable) So more the stimuli more recruitment of muscle fibres and hence more contraction and more tension Strength of stimuli influence muscle Frequency of stimuli influence muscle fibre

[@IvileSomfongo]

Exactly this is my question now 😢 action potential is the same 😢or Is triggered by a specific voltage

[@seo7634]

Amazing - thank you!!!!

[@chandrakshetri18]

Very powerful explanation. Thank you so much

[@NinjaNerdOfficial]

+Chandra Kshetri Thank you!

[@amenzulfiqar135]

Really good. Thanks

[@bogdansheremet3691]

Great job!!!

[@oliviawarren8125]

BEST VIDEOS EVER!

[@yazsam930]

Thanks a lot bro 💚

[@JohnSmith-px8sr]

The Vincenzio story at 12:11 had me dying. That came out of left field. HAHA.

[@marissapost91]

Great videos. Good explanations

[@faerieeali4013]

Helpful video 👍 thanks

[@boilix8914]

R.I.P Vinchenzo 🙏 [Reason of death: A slap with a glove from a smart hulk]

[@a_sfory]

The best ❤️❤️

[@hashimmughal7907]

Best lecture

[@shraddhamahat3126]

Thank you.🙏🧡

[@qamaralam7117]

Jazak ALLAH ❤️🌺

[@gooddoctor6434]

Love yoooouu😍❤

[@neolecta7896]

Thank you! 🦔💙

[@martin2801-z2w]

Excellent information, especially liked the size principle explanation. Still, I would love to know "how" the motor neurons of the smallest muscle fibers are the most excitable.

[@nidanisar]

Martin Weihrauch since they are small, their threshold potential is low, they need low potential to excite them, therefore, they are more excitable...

[@Ùpdùlqaðìr]

most excitable, they have low thresholds. Hope youre no longer a student now😂😂

[@martin2801-z2w]

@updiqadircade5639 Thanks! Nope, I am indeed graduated now. This knowledge was useful to me during my PhD defense ;)

[@Ùpdùlqaðìr]

Nice to hear. Congratulations and best of Luck in your next endeavors. I am watching this for my undergraduate B.pharm classes@@martin2801-z2w

[@12.mayukhghosh53]

22:33 the time i lost it......awesome presentation

[@ARYANGUPTA-si3fl]

Sir in the part where muscle fibre is stimulated by increasing stimuli and fibre contracts with different tension here all or none law isn't applicable why?

[@hareshbro6803]

Hi I had the same doubt but u can see he explained The strength of stimuli concept by using a muscle (not muscle fibre -All or none law applicable) So more the stimuli more recruitment of muscle fibres and hence more contraction and more tension Strength of stimuli influence muscle Frequency of stimuli influence muscle fibre

[@dreric6366]

Thanks Sir ❤️

[@manuji9546]

Osm video Dr

[@rouahamed3126]

It helps alot, thank u

[@vivekmehta7882]

Does it mean that the same muscle have multiple threshold potential? Than the one we study i.e having a -55mv is which muscle fibre?

[@-Noushin]

I think it's an average value

[@gooddoctor6434]

Love your way ❤❤❤,

[@AbdirahmanMubarak]

Appreciated

[@AadityaSwami-vr6kp]

thanxs sir

[@ChrisSay71]

thank you. big help

[@eymanwasim3191]

If I'm not wrong, you mentioned in the muscle fiber video that the type IIx muscle fibers are the intermediate sized ones but they are 3rd in the order of recruitment. But in this video, you mentioned the 2nd in order of recruitment are the intermediate sized muscles. Can you please explain this?

[@medicallifewithjohn]

awesome

[@manar-nasser]

شكرا جزيلا

[@dhananjaysharma5252]

That Vincenzo guy seems to be a very close friend of yours 😅... Overall another great video from you brother!!!!

[@jessicabraho1248]

Amazing

[@Desmondavid]

Awesome vid

[@tori_whatsherface]

RIP vincenzo. But he helped me learn muscle physiology so--

[@28med_harshpandey44]

Zack is actually threatening Vinchenzo 🤣

[@gooddoctor6434]

Greeeeeeeat❤❤

[@tahirabbas9476]

great lectures man!just one question,y does the tension not cross maximal tension like what exactly stops the tension?i know that the muscles maximum capacity is reached but what actually governs this limit??

[@kkalsuwaidan3872]

You’re the best

[@twilliams1623]

I had a question, looking at the size of the muscle fibers being recruited, you stated that the smaller muscle fibers are recruited first then the medium size and finally the largest. However, on your muscle fiber type video, you mention that type IIx are the most powerful yet medium sized and the type IIa are the largest but are more for sustained effort. Can you explain.. Thanks,

[@vLion]

Great

[@abelabera807]

Whats all or non principal of muscle tension ?

[@abdulbaryalhalimi4875]

Thank you so much for this great video. If you let me, I have a question. If I added a stimulus that is greater than the maximal stimulus, wouldn't that make the contraction longer in time? if not, could you please explain? Thank you..

[@SergioPerez-oo4xy]

Abdulbary Alhalimi it wouldn’t make the contraction longer because once maximal threshold is met. The muscle would produce maximal force at a maximal frequency. The large stimulus would however build up and allow for another contraction to happen ( after it repolarizes ) which will stimulate it again to maximal tension. Which would lead to full tetanus. But if you add an outside stimulus ( tens unit) that continuously supplies a stimulus that is equal to or great than maximal stimulus threshold then that would keep the muscles in a contracted for a longer period but that would induce a tremendous amount of trauma to the muscle causing tearing that would leave the fibers in a state of prolonged soreness or worse. Lucky the body has an array of efferent sensory fiber that help maintain proper force production and fail safes to reduce neural drive of the muscle is in danger of shifting into a state that would harm the organism.

[@shailkumarjain]

@@SergioPerez-oo4xy could you mind explaining how about all or none rule ? If a muscle fibre is activated to threshold it will fire to its pull potential. So it is not applicable here ?? Could you mind explaining please. Thank you.

[@jpatino13]

I have a question, I thought Temporal summation is the same neuron firing at interval not different one, would you be able to answer this?

[@akkashyap4694]

Yes

[@drgaurikumar9494]

Sir would your videos help with usmle questions as well? I am preparing for step 1.