"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.
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 😭😭😭😭🙌🏼🙌🏼🙌🏼
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
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!
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.
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.
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
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?
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
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)
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!
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 :)
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...)
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.
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.
@@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.
@@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.
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
So you have an incredibly hot blonde on...and immediately start discussing "insertion bones" and "insertion points". Are you TRYING to make it easy for a certain sub-class of RU-vid commenters?
minarri Maybe it will help you to know that the commenters on her vlog are all super respectful, supportive and friendly (to her and each other). Or to know that in addition to being a student of biology and education, Claire is a bodybuilder--so it was probably fun and satisfying for her to be able to contribute to Crash Course in this way. Hopefully, I think, this all is enough to outweigh the male gaze comments and make RU-vid a positive experience for her. Not that those comments don't suck.
They only suck if you consider an expression of a persons sexuality to be negative. But a progressive, sex-positive person like you wouldn't say that about the sexuality of men and/or lesbians would you? /extreme sarcasm
Right? I noticed that too. I'm assuming the commenters are little teenage boys who haven't seen a woman before, but it definitely doesn't make it okay. I was one time not allowed to teach middle schoolers during a science outreach project because they "probably wouldn't be able to pay attention" and that's really says something about or society. You'd think a science video would stop perverts and rape jokes, but it never really ends. As soon as a woman appears in any video for even a brief second, it changes everything and the harassment starts. The fact that people can watch a physiology video and only take sex out of it is exactly why I take pepper spray with me everywhere.
Cassie McNaney Or maybe that speaks to the maturity level of a bunch of middle schoolers you dunce, there's a reason why we tend to teach more complex points to people when they're older than 12. Also you act as if any amount of education would stop people (especially kids) from finding certain body parts funny or attractive regardless of context, what a puritan way of thinking.
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.
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
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.
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!
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. :)
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?
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.
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
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.
How come all muscles pull. what about Lateral Pterygoid? Muscle of mastication used to open the Jaw.??????????????????? Superior rectus of eye is also a muscle of push.
