Muscles, Part 2 - Organismal Level: Crash Course Anatomy & Physiology #22

[@DenellaGaona]

I REALLY do not know how I'd get through nursing school without you guys thank you!!!!

[@AndreaGonzalez-gq3jo]

i’m a medical student and i gotta say, these videos are pure gold, i watch them to give me a brief summary of what we just saw, and I was seriously impressed by how much detail there is in these. Thanks Hank

[@annelmoreno6862]

THANK YOU HANK AND CRASHCOURSE TEAM FOR EVERYTHING YOU DO FOR US STRUGGLING STUDENTS. YOU HELPED ME UNDERSTAND 4 LECTURES WORTH OF INFORMATION IN JUST 20 MINUTES (I watched 2 crashcourse videos on muscles) I AM FOREVER GRATEFUL 😭😭😭😭🙌🏼🙌🏼🙌🏼

[@davidsalinas9]

I'm in human anatomy right now. And man. Because of you. I changed my grade from a D to a B+ bro YOU ARE THE MAN!!!!!

[@corisvibing7194]

When my science teacher explains it she is so serious and she doesn't make it fun but he makes it easy and fun for me to learn it and for me to actually pay attention because science is my favorite subject.

[@coryrice1350]

Hello CrashCorse! A friend of mine recently recommended your channel since I teach anatomy and physiology labs and he felt your videos might be beneficial to my students. I must admit, I'm impressed. I was expecting grossly over-simplified explanations with borderline inaccurate information which would be misleading and/or confusing, however your presentations are simple, accurate, and engaging. I really like what you all have done! During my labs I like to imagine that I have the energy and charisma that Hank does, but in reality I probably more closely resemble Ben Stein from Ferris Bueller's Day Off... Anyway, I digress. Minus a few tidbits here and there, your videos touch on much of the information I present prior to carrying out lab exercises. I have enjoyed your videos and would like to post links to some of your content as supplemental material for my students. If this is possible let me know. Thanks!

[@Abominatrix650]

Shoutout to Claire and the corgi! Thank you for helping us all learn!

[@RicochetRita]

CrashCourse Fitness with Claire?

[@seriliz00]

That would be fun! Like the science behind muscle growth and fat loss? I am interested!

[@gracebrewer4281]

I use these videos to preview and then review each subject. They are so incredibly helpful!

[@RogerRoids]

That shaking molecule is bothering the hell out of me.

[@clp480]

RogerRoids thanks 😩😩

[@ainsleysdelusions]

Haha ikr! 😂😂

[@RejanBregu]

too much inestabillity in the tambe I guess...oh I mean in the number of elecrones

[@nikkikanefsky9318]

i think he's cute

[@StarLight-bp6hg]

(͡° ͜ʖ ͡°)

[@bernardoguerrero1630]

I just binged all the videos in this series to review for my exam today

[@88and6]

Bernardo Guerrero Doing the same now lol. How’d you do?

[@evader3371]

@@88and6 LMAO me too!

[@abhiroop7163]

I have my exam tomorrow

[@NoonCall]

@@88and6 he did so bad on his exam he never left

[@dustinsalisbury4383]

Lol any of y’all pass?

[@RunninAD]

"The stapedius in your middle ear, which I've been doing my best to workout lately, but I just can't get any tone." C'mon Hank, you're better than this, how could you miss that pun.

[@spaulding304]

Granted he said definition not tone.

[@ToriKo_]

World of No Borders deafinition

[@spaulding304]

😂

[@travisk5589]

@@spaulding304 He was suggesting that the writers said tone instead of definition.

[@whatabouttheearth]

I seriously think he may of said said definition out of empathy for his viewers. Because definitions fly by on this show. That may of been the joke.

[@crashcourse]

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: apple.co/3d4eyZo Download it here for Android Devices: bit.ly/2SrDulJ

[@zarkahameed8470]

Your videos just make things very clear and even more easy without confusing the audience..

[@jonathancook1627]

"how can Claire gently pet this can at one moment and then quickly crush a corgi in another?"

[@catrafish6965]

hol up

[@dherd]

That'd wake the people up haha

[@vrstovsek]

I love this guy! He just puts smile on my face :)

[@mrgallbladder]

Judging by your "house" picture, your face doesn't smile very often lol

[@alalize]

Anton.d09 It's all the more important, then.

[@UzumakiNaruto-ez8jc]

vrstovsek Gregory House...

[@shaterproofblosm]

vrstovsek Yay :D good for you, i love hank to. And anyone else bent on improving humanity just because for that matter... I dig hanks energy bro, i dig it.

[@davidndiulor8428]

I love that 'smile' on your face

[@Backcornerboys]

Ideas for another video: Why do muscles get stronger with repeated use? How do hormones affect muscle development? How does adrenaline affect your ability to contract a muscle against greater tension or with less rest? What happens when you pull/tear a muscle?

[@MrTeacherDO]

*Why do i suddenly feel the needs to lift a building?*

[@MsDafiM]

Yay Claire! What a lovely and very appropriate surprise it is to see you on an episode about muscles! :)

[@leannecameron9375]

Thanks CC, so fascinating! Would love to see your explanation on how a muscle gets stronger and bigger.

[@gmfPimp]

These videos are very well done. The amount of information presented in such a short amount of time would normally be overwhelming. The approach used works very well.

[@genanhamideh3097]

this episode made my brain blow up and me cry

[@voicedify]

I just a read a chapter in my A&P book and immediately discovered this channel. This video helped me understand bits and pieces of information that I was struggling with. Thanks!

[@november2235]

I want to thank all of you on Scishow and Scishow Crash Course for helping me score 12 (A) in my biology exam last week. A lot of your videos have been very helpful to me. I want you to know, that I think you are doing a great job :). Thanks a lot!

[@oafkad]

She reminded me that I really should exercise. *reaches for glass of water* *sweats profusely*

[@Thomas_Winters]

two people in one video? im feeling uncomfortable.....

[@poplovers8608]

😂😂

[@nadahabib8109]

I became addicted to you hank i can't sleep without watching one of your videos your explanation is very easy and clear i wish i had a teacher so fun like you

[@chase0734]

Yay! Claire now has her own CrashCourse character!!!

[@moonchild2751]

your videos are amazing ! you're like THE best teacher ever !

[@MJLionnavy]

This show needs more Abby!

[@hannahb8895]

That is my science teacher, Claire! ❤️

[@cavemanindustries5102]

Muscle contraction distance (duration) is frequency modulated by calcium released by your synapse, and variable contraction forces are generated by segmented groups of muscles that vary in amount of fibers and therefore create additive or stabilizing forces.

[@Naiadryade]

Yay Claire Grosvenor! Been waiting for this. So glad you can put your physique to work for education! Looked like fun.

[@AME428]

"Like walking and squatting and drop kicking." You never disappoint Hank!

[@caribaez5711]

the motor units and fibers animations are so adorable, especially the biggest fiber motor unit. I like the video.

[@The-Rain-Ninja]

These videos are great. Not sure who does your videos but I am a graphic designer and they are well put together. Great work!

[@chase0734]

Thank you Claire Grosvenor for being a great demonstration :)

[@crazyvoid8002]

You should cover a whole video on slow twitch and slow twitch and size of it

[@queenviterythedavada6697]

When he say smashing a key boread ...... With the forhead I laughter so hard.

[@WolfhoundWife]

Queen vitery The davada omg I couldn’t stop laughing!

[@pussinboots838]

I laughter all the time!

[@mesmarriott127]

Brilliant series. Keep them coming please, Hank.

[@Mearch]

Awesome video Hank! This was some really usefull information for my upcoming biology exam. I liked the comedy in there aswell, you guys really make learning fun! :D big thanks to the whole crash course crew :)

[@averi_qq]

I don't get why people dislike their videos?? they're amazing :)

[@DreamingIce]

Huh. 2 years of comparitive anatomy study for Vet, and no one managed to explain insertion/origin points to me so simply... WHY DID NO ONE PUT IT LIKE THIS?? IT WOULD HAVE SAVED SO MUCH FREAKING OUT! (And wrote learning, cause that ended up being how most of us got through the insertion/origin points of muscles...)

[@astarvard]

That's exactly the same thing I need to study for school... but in a fun and comprehensible way! I love you all!

[@josephfox9221]

I would love to see you do a video on how muscles build themselves up. and how that translate to more power later on

[@mysteriouskiwi9965]

Keep doing what you're doing Hank! I genuinely enjoy what you teach and the way you teach it! :) CrashCourse You guys are awesome.

[@ThZuao]

I just love how a Thought Café put cute little faces whenrever they can

[@alexbeard7108]

big thanks from the future massage therapists of spa tech institute

[@slusheeeeez]

4 years later and you’re still saving my butt

[@elementarywatson5345]

Have you ever thought of doing a PE crash course? I don't know exactly how it would work or how necessary it is. But, this video made me think about it.

[@joeyb649]

There is a refractory period after the contraction period, but before the relaxation period. After a twitch this is the brief 1-2 ms period needed to restore the resting potential. During this time, The sarcolemma is repolarizing and will not respond to a new stimulus. It may respond to the first twitch but not the second.

[@leannab5785]

Thank you for closed captions for all us mere mortals.

[@lockhrt999]

I feel there's a need for at least one more episode on muscles covering how the body building works, what are contractions, shin splints etc

[@travisk5589]

I vote for more Claire.

[@cellogirl0096]

Yay for Claire! Proud Arandanaut here!

[@smurProductionz]

You guys are great! Please never stop doing what you‘re doing!

[@curly2828]

Your videos are helping me so much with my exams

[@XhanAnimations]

Hank trying to lift the building XD

[@unpickledpickles4477]

Cute butt, though!

[@dm_nimbus]

I want a corgi...

[@WiseWik]

James Craver I want a Claire

[@FROPDESAI]

James Craver You support KurzGesgt. Thank you!

[@dm_nimbus]

FROP DESAI Don't thank me; they're the ones who are awesome

[@timothyso9781]

+WiseWik ???

[@newwrld9534]

You got a baby instead

[@Xenro66]

[CONTRACTIONS INTENSIFY] - Hank Green 2015.

[@katp9116]

Best science related videos ever.

[@DONi90ify]

Learning and laughing at the same time....Means you're doing a GREAT job

[@BriWhoSaysNi]

5:24 Ah, good old sibling rivalry. Where would we be without you? lol. Smooth one, Hank.

[@reredrummer123]

This is also a great video for people who wanna know some principles for exercise

[@conniechristensen9943]

I love this guy! He is my official tutor!

[@kmacdiddy1]

haha the smiling motor units really tickled my humerus bone. This series is so great! Thanks!!

[@NikolajLepka]

Go Claire!!

[@FROPDESAI]

Nikolaj Lepka ( ͡° ͜ʖ ͡°)

[@didituki4881]

Thank you so much! This was just what I needed. I was SOOO curious what happens when I have muscle twitches... and what was happening inside my muscle when my twitch happened

[@cherylrajewski3390]

Love all your videos! This one is special because of Abby the corgi!

[@whittrinh4733]

Thank You for these videos. These are great for learning it in a quick time and for review before an exam.

[@Cookieforevah]

Claire really helps me to understand this. Especially when she works out. She should be in more crashcourse videos.

[@abinethilete5080]

abinet the highlight of the video is how exactly explained how the muscles contracted i think it helped me alot on my test

[@NarutoUzumakiofficial]

The thumb nail reminds me of the titans from attack on Titan

[@thelonelydirector]

Naruto Uzumaki Or, if you're older, it reminiscent of Frank from Hellraiser.

[@UzumakiNaruto-ez8jc]

Naruto Uzumaki lol

[@kawlaha.rahman7360]

How about a petition to clone Hank :P

[@alexandriacadet8448]

"isometric contractions and possibly a hernia" lmao! i can't i was dying with laughter, this guy is so funny lol!!!!

[@Greenthumb-420]

i like the material he just speaks so damn fast!!!

[@davidndiulor8428]

"Muscles never push they always pull" I wish I pulled like Hank😉

[@daniellasalguero2578]

Starting watching yesterday!! best science videos ever! I am able retain so much information because I am actually learning. I have already recommended/sent link of this channel to people.

[@TheCuriousNoob]

08:31 Why does Motor Unit 3 have his mouth open and tongue out?? What a weirdo.

[@TunkPotterSV]

The Curious Noob I think Clare has something to do with that

[@timothyso9781]

+Alberto Granillo oh no please don't go there

[@songkhaing4420]

Oh my god, I lost it for a few seconds when I saw it; it was so funny.

[@AutoDidact117]

Maybe as it's energy intensive work which requires hell lot of ATPs and oxygen.

[@KarstenOkk]

Is closing your eyes considered using your eye muscles or relaxing them?

[@greennitricoxide2706]

your eyelids have different muscles than the one you use to move your eyes. The orbicularis occuli closes&opens your eyes, while there are six other muscles that move your eyes. But closing is relaxing.

[@williamlowry8809]

@@greennitricoxide2706 Pretty sure the relaxed state for them is open; just look at dead bodies. We tend to assume the opposite because we close our eyes while sleeping, but we do that to decrease sensory stimulation.

[@gurinderpreetsingh1256]

@@williamlowry8809 Actually, like said in the video, muscles tend to flex instead of push. Closing your eyelids would be more of a pushing action since you can't really have an origin where your eye lashes are (skeletal muscles need bones to connect to). Opening your eyelids would be the pulling action, so the closing action would be relaxing them. Open eyes after death are typically dependent on sudden deaths and a shut down of nerve impulses, but deaths in hospitals or during sleep result in closed eyes after death. Dead bodies don't always reflect a natural and relaxed state.

[@sophiezheng4595]

Gurinderpreet Singh your obicularis oculi closes the eye, skeletal muscle doesn’t have to attach to bone. It can attach to ligaments, skin, or other muscles. The obicularis oculi is a sphincter which almost always closes an aperture like the eye

[@cakeman688]

I legit thought the title said "Muscles, Part 2 - Orgasmic Level" for a second...

[@TheDatolo97]

cakeman688 Me too

[@AP_505]

cakeman688 Hahaha same I was like wtf are we going to learn about what happens to our muscles when we orgasm

[@crazysquirrel879]

Yeah me too i. Never even noticed untill i read this comment before I was like okay..... How does this have any thing to do with orgasms

[@JenDeyan]

cakeman688 Guilty...

[@subh1]

cakeman688 I was thinking that all along, until I saw your comment.

[@mohammadnassar7824]

WHY DOES THIS MOLECULE (don't know if it is named like this in english) ALWAYS MOVING!!!

[@crashcourse]

4ever Moh The little guys on the desk? Some of the attachments are springy, so they move when the desk/Hank moves. They also change every few episodes because we occasionally have to take all the props down for other things and then Hank gets to amuse himself by rebuilding them. -Nicole

[@mohammadnassar7824]

Thanks i can finally sleep :P

[@mohammadnassar7824]

💨mind-blow

[@MS4E]

CrashCourse I knew the reason it was shaking. but please MAKE IT STOP!!! :'( it was really annoying! I had to go check another couple of videos to see if it was always like this (it was not)

[@mohammadnassar7824]

Maybe they WANT you to go check there others videos o.o

[@xXxM3llYxXx]

When will you guys be starting on the topic of philosophy? I know you touched on the matter briefly in your videos on psychology, but I'm interested to learn more on the subject. Thank you for the educational entertainment guys. :)

[@imaswifty4eva]

Maybe I should have watched this *before* my test.

[@didituki4881]

It's interesting how muscle fibers are sometimes stimulated by a nerve ( which are very tiny )that can cause a muscle in your body to twitch and you feel it sometimes.

[@Dewstend]

This gave me some interesting insight on muscles, I've been learning about hypertrophy for some time now :)

[@teganrichards6108]

I love that you had a woman to do 'the heavy lifting', great inclusiveness and showcasing that women can do what men can do :) . Love the show Crash Course, it's helping me get through Uni!

[@thecat944]

This episode reminds me of times where we thought the item we were about to lift was heavier...than it actually was. Thus it involved our muscle tissues preparing for much more than what was there. The result is always hilarious.

[@pantel875]

I think I read somewhere that the muscle fatigue is more so caused by the accumulation of metabolites than the depletion of ATP; that studies showed that the ATP supply is relatively constant?

[@seleuf]

But were any Hanks harmed in the making of this video?? D:

[@luciaa5912]

Woah that’s my science teacher

[@sashahesketh]

woah

[@randomjunk1998]

I listen to these while lifting

[@Debt-tective]

Thank you for this. I read over the chapter and it was confusing. This helped me understand what it meant. You guys are awesome.

[@Zeldaschampion]

I have this feeling they got the only person in the whole office that actually exercises to do this video.

[@camillemagnan6956]

you're the reason I'm passing my anatomy class lol

[@messagedelivered3716]

The part where Hank is trying to lift a building XD!!

[@notchpoodles5864]

Honestly the best part of this video was Abby >w

[@chrissietian2474]

Thanks love, you've been helping me through chem and bio classes..whew .Love the corgi, I had when I was growing up. Best dogs!

[@PHEOSETRIN81409]

so much better than death by powerpoint. great energy and comical relation of latin laden anatomy to less confusing bruhaha