Musculoskeletal System | Muscle Mechanics | Types of Contractions & Levers

[@24YouOnlyLiveOnce24]

You say YOU appreciate us watching your videos but you're highhandedly doing a much much much better job than a combined 8 of my "professors" & I'm not even exaggerating. I've stopped attending lectures and I'm mostly dependent on you, thank you so much for your hard work & effort.

[@icianian]

Thank you so much. This is so helpful. I should just send you my tuition because I learned so much watching your videos compare to what I learned in class. Continue to do what you do. You're awesome!!!!

[@moayadswaid944]

for the first time in my life i am actually enjoying studying , thanks man.

[@user-lb3ev1lf1p]

When it comes to the human body, your in the TOP TEN here on the world wide web!!! Kudos!

[@santiagoortega9609]

Thank you very much to the instructor and to everyone involved in making this videos. You guys are absolutely making KZbin a awesome place to learn. Hope the best for all of you!

[@leemuelstevet.rodriguez232]

You made it very simple to understand. Thank you very much. In this manner it doesn't a genius to learn and appreciate anatomy and physiology. You made learners spent less time and not sacrificing the quality of learning in this topic. Again thank you very much.

[@JamezBnd007]

I just watch your vids on my free time! Your vids are so well prepared, i enjoy learning from them. Thank you Ninja!!!

[@trudilaris7580]

That was great content!! Made something that was confusing to me so clear. Thanks once again. Can't get enough of your videos!

[@DrBatoula]

An Egyptian med school student thanks u very much Doctor, such a useful video🌟🌟🌟 another thing, in 9:20 the sound of "remember" just like the (remember, if u in fire STOP DROP and ROLL), I am full focus👀

[@bloijack]

Thank you so much! The best explanation on levers i found in KZbin.

[@naledithato1371]

you're definitely going to be in my graduation speech!! S/O to you and all your hard work x

[@inspcenter3]

Thanks so much!! More helping then most teaches I have had

[@martin2801-z2w]

Every video deserves at least 100, if not 1000 times more views.

[@dondamishitha468]

Should comment💬 this simply extraordinary lecture I can't get clarity on this topic If pay even Thanks sir All my physiology knowledge is only because of you

[@shield-zu7sx]

you are the best.....you make things very easy for me ,may God bless you with more knowledge

[@waynechanner4339]

Bro you BEASTIN!!!!! Much better than my classes

[@dhruvsudan8593]

Thank You Zach Sir and the whole team for this Amazing lecture... 🤗

[@marichihernandezgarciadelv2497]

I love you, I was so stuck on the levers part during my physics class on biomechanics ❤️ I hope you have videos on fluids and waves too haha You are amazing! Thank you for helping other people xx

[@AhmadKhan-lh7mk]

This lecture help me to clear my concepts on levers thanks 🌹

[@pengjunsun3683]

You are helping so many people

[@arunjotsingh1767]

you definately key for success of many students🫀

[@Ololola1872]

He was very willing to make us understand and thorough!! Love it.

[@franknyirenda2673]

THANK YOU VERY MUSH SIRE YOUR VIDEOS ARE HELPFUL

[@sleepyhead27]

If I ever meet you in person. I’m going to hug you. I can’t believe it’s 2020, it’s still so outdated in school. KZbin is better than currently zoom (corona), but you get what I’m saying. Professor sounds like she’s reading a script. Video demonstrations are still robotic & pixelated. Crazy right.

[@Gionormic]

I am a physiotherapy student and this is nice revision!

[@RemedyMixSA]

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[@riyanbabar8416]

Phenomenal lecture 👌 👏 🙌 Thank you so much ❤

[@gaffarmustafakabal2970]

I'm in love with your lessons

[@ananyasharma6247]

Thank you so much,Sir. You're my inspiration. I wish to be a ninja 😎like you and get all my concepts cleared 🤩👍.

[@rendlapavan6153]

Really excellent teaching 🙏

[@amirbhz8901]

Perfect lecture👌👌

[@Learner7777]

it's an Awesome lec Thank you sir Love form India♥️

[@bobbym.99]

Thank you so much sir.....your videos make all concepts clear💐💐💐💐thanks a lot🙏🙏🙏

[@changumoroko4190]

This is really helpful.Thank

[@defneesraklc1739]

You are excellent. I m grateful. Love from Turkey.

[@alicenotinwonderland4567]

You're a G, man! Thanx!

[@inspcenter3]

And work with my dyslexic issues so well !!!😂 amazing

[@barnabykent6698]

I absolutely love your videos! You have a natural talent in teaching. I have a question, forgive me if it's a stupid question. You said that in an isometric contraction the load force is more than the muscle force. Wouldn't that mean that the muscle force wouldn't be able to hold the degree of flexion (in your example of a bicep curl) rather than being able to hold it at the same degree? Why isn't the load force equal to the muscle force in an isometric contraction?

[@mujo110]

I think you are right. Physics laws (from my understanding) of action/counteraction produce zero movement from force produced by these two opposite actions ONLY if both are equal .. if any of them is higher than the other, you would see movement in the direction of HIGHER-FORCE ACTION

[@lilianasantiago5593]

Saludos desde Mexico, buena clase

[@tripti1339]

Thanking u with all my muscle fibers..

[@botatolegen3620]

Thank you very much ❤️❤️❤️❤️❤️❤️

[@radubraduro]

Wonderful explainer! Thanks, it is very helpful! :)

[@FVQuotes]

Thank you so much.. it helped a lot✨✨

[@KMPark]

You are the BEST

[@carzyscenctist]

This is amazing

[@KS-jf2ny]

great teacher

[@CoajaCristiandance]

insane content here

[@badass_Bosdke]

God blessed us with your existence Sir!😅😊❤

[@Navneet1980]

thank u so much zach

[@angelateasdale2692]

Thanks Ninja.. appreciate your work so much :)

[@Bllack]

[@sadianisar9126]

Thanks sir. A question: In isotonic (eccentric) contraction the tension is even greater than isotonic (concentric) contraction but in graph of tension/time it is shown that in muscle relaxation (eccentric contraction) the tension is decreasing,?

[@rodinaacharya4384]

yeee woww you are awesome ! Everything what you say makes sense.I have leraned so much !

[@iqra4397]

😍😍really helped me great vedio boss!!

[@aezrakim5447]

You are a life saver! thank you so much!!

[@alicew8625]

Fab video, Thanks!

[@eslamfathy9985]

Amazing .thanks doctor

[@yazsam930]

Amazing ... thank you so much

[@haruhi63JB]

Thank you so much

[@asihak]

Thank you... 👍👍👍👍

[@kiniohri2174]

So solo helpful. thank you so much

[@josephenricdy4552]

Thanks!

[@sajiruddinsk8129]

Very good, Jarur,Murshidabad, WB India🇮🇳.

[@aaronlopes5256]

Thank you very much for this awesome explanation, can you also please explain isokinetic contractions?

[@MatuszDawn]

As always, thanks so much!!

[@aidabach]

thank you

[@Abdullah-hk4by]

Your are the best 😍😍

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holy cow i found gold!

[@amnaamohammed1085]

thank you it was very useful

[@me8933]

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[@mervenuryasar7398]

very useful , thank you for the video :)

[@ChrisSay71]

thank you. big help

[@jamesmatawa8577]

you rock

[@aliloay9894]

thanks man

[@katefloridadaeelledagle4076]

Hi. Does the classification of the type of muscle levers remain the same even if there are changes in the context of a movement?

[@janmariecabrera1554]

MA>1 = Force arm > Resistance arm; Mechanical disadvantage MA

[@tripti1339]

Didn't really understood the lever.. 😁 But thank you so much for the rest of it.

[@gurusingh3402]

Thanks

[@mukulgidney]

In whixh video does Zac talk about the length tension relationship and velocity . I've been searching for it for hours noe

[@azchirousa]

Thank you for the video. However, many biomechanic textbooks refer to a moment arm. Are they referring to the Resistance Arm or the Force Arm? My guess would be the Force Arm?

[@creativityreimagined]

Sir, why is the tension-time graph not constant in case of isotonic contraction? It's supposed to mean "constant tension" isn't it?

[@caitlynnichols3632]

You are amazing! Thank you!!!!

[@NinjaNerdOfficial]

+Caitlyn Nichols Thank you very much!

[@munazatulislam108]

Are uh in sirs paid course?? kindly reply

[@vitikadhamija9784]

Hi I'm basically a new subscriber and currently a premed student. We are dealing with muscle physiology rn and given just a 1 line definition of these stuff. In the lower classes we were taught Muscle contraction is basically the shortening of the sarcomeres of the muscle fibre. Now its all confusing what is actual muscle contraction and relaxation ?

[@neurosurgerypassion2139]

expecting videos from microbiology ...general basic principles of microbiology etc etc....please do consider this buddy

[@smilyyyflower175]

i cant thank you enough

[@medicallifewithjohn]

awesome

[@Smithavidental]

Thanks for the video, I have a comment regarding Class 1. i think there was a mistake. you have mentioned two forces in the same directions. you have said clockwise twice. Thanks !

[@oblomov4580]

In isometric contranction it should be load=force

[@10SoccerCrazy]

Hi, what is the differences between ''moment'' and ''momentarm'' ? in order to create moment, is it: Force * momentarm = moment??

[@ashleyneumann3169]

I need some help. Class III levers: In the lever "see saw" example, the load torque is described as going "clockwise". In the biceps and free weight example, the load torque is described as going "counter clock wise". Does the direction of torque for the "load" and "effort force" matter? Or as long as they are inversely proportional, it still works out? Thanks! Other than that, I love how you described this. Thank you!

[@n.sambedprakashpati3271]

yes the direction matters cuz torque is a vector quantity and Force cross R gives the direction to it ... only if they are opposite in direction then they can bring equillibrium

[@naurnootnoot]

Wouldn't you have to exert more force than the load to achieve concentric contraction? If the force is the same as the loadforce it would just be the same as isometric right?

[@tanyaradzwafasenda6529]

Nice

[@diellzadibrani6122]

How can the contraction be isotonic if the tension generated by the mucle increases while shortening?

[@albaespinal3942]

I need a little more clarification. I am trying to apply this to a split squat and it is driving me insane. I know it is a class 3 lever but am having a hard time identifying torque and folcrum.

[@SportifyTVofficial]

In the begging you said that eccentric contraction the tension is even greater than concentric contraction, shouldn't it be represented with an even higher increase in the tension/time graph?

[@hadia4049]

waoo amazing

[@neurosurgerypassion2139]

thanks buddy ...love u ..:)...

[@Hr-zc4jm]

thanks for your videos!!! it helped me a lot! but i have a question about isometric and isotonic contractions. is it possible that there is isotonic and isometric contractions in one movement? for example: you want to lift a weight of 10 kilos from the floor. id you pick it up its isotonic contraction, but when you hold it in your arms, is it still isotonic ? or is it then isometric?

[@NinjaNerdOfficial]

+Hr if you have an isotonic contraction it can be broken down further to either concentric (muscle shortening) and eccentric (muscle lengthens) if you’re picking up a weight it is an isotonic contraction but whether it is concentric or eccentric depends. Isometric is just saying that there is a muscle contraction but with no length change. This can be related to your example if you are holding the weight and not able to move it any further but still contracting (just not having any change in length).

[@Hr-zc4jm]

Ninja Nerd Science thanks for your answer, but its still a little bit weird to me, because the muscle changed his lenght when you picked the weight of 10 kilos up from the floor. so when you hold it in your arms, the lenght of your muscle is still changed, but thats also called a isometric contraction because it doesnt change anymore?

[@NinjaNerdOfficial]

+Hr using your example, if you're performing a preacher curl the moment that the muscle shortens as you bring the weight up that is considered to be an iso tonic contraction. However let's say that you try to curl the weight and it moves upwards but you get stuck at a certain point were you can't move that weight anymore, therefore it is not moving up or down it's just staying still.There is still a significant amount of tension just no continual change in the length. This is considered to be an isometric contraction

[@Hr-zc4jm]

Ninja Nerd Science thank you so much :)

[@zemara2344]

Petefect thank u

[@educlinstand]

Isometric = H-Zone and I-Band remains the same? Isotonic = H-Zone and I-Band varies?

[@carljohnson850]

That is something i also want to know :)