The Nervous System, Part 2 - Action! Potential!: Crash Course Anatomy & Physiology #9
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- Опубліковано 16 тра 2024
- What do you and a sack of batteries have in common? Today, Hank explains.
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
Chapters:
Introduction: What do Neurons Do? 00:00
Your Body is a Sack of Batteries 1:18
How Electricity Works Inside Your Nervous System 3:18
Sodium-Potassium Pump 4:04
Types of Ion Channels: Voltage-Gated, Ligand-Gated, and Mechanically-Gated 4:51
Graded Potential vs. Action Potential 5:45
Depolarization 6:19
Repolarization 7:35
Hyperpolarization 8:00
Refractory Period 8:14
Review 10:06
Credits 10:29
Crash Course Kids Preview! 10:39
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I really can't get over how selfless this is. Thank you so much
they get the money from youtube so it is not THAT selfless but it is amazing they dont want people to pay them, incredible, i love this
I'm sure the money they get helps fund the quality content we get from the animations to other resources. And fund them eating, which means they live so that all of this content can exist period, lol.
Danielle Lutchman ?????
👍
Vianney Eudes hey those gaming channels help me laugh in the middle of a mental breakdown thank you very much
When you're in college and you don't understand the instructor but this makes more sense than the person you're paying to teach you...
Same! I'm currently at the university and I was using crash course to prepare for IB finals in high school but this content is very useful even today!
Exactly😂😂
BIGGEST BUBBLE = academia.
Once accreditation becomes more decentralized - it will be radically restructured; and good!
I can't believe how in 11 minutes I learn more than a 5 hour class of neurology.
Same for me and my anatomy class!
roman dorta I feel the same
He's awesome and takes longer just edit out spaces
Sooooooo true
So far the epistemology is completely wrong and based on Hogkin Huxley which is dead.
crazy this is free and more people understand then in school
damn right bow to your king
grammar is for bitches
Sir Ali-V, you are a sexist uneducated know it all FOOL! Learn to express yourself in a less egocentric way. Leave out your sexist remarks & learn correct spelling & the correct meaning of words & your remarks may be taken more seriously. Using 'then' not 'than' in the context of your remark is a spelling mistake not a grammatical error! Stooping to Sarcasm & sexism is a sign of ignorance in a person in a verbal disagreement.
+Layla B He doesn't know the difference between a spelling error & a grammatic one :) Add the sexism & it's also "Good luck being a man" lolz
Don't feed the troll.
Im graduating this semester, and in my graduation's speech im gonna thank you instead of my professors!!!!!
+zomorrod rouhi amen
When I do in more than 6 years I will do that too lol😂😂😂 not even kidding I am a nerd 🤓 for knowledge
Same here!
Say "Nah nah na boo boo on you!" to your professor.
agreed
That moment he says "You probably know enough about biology by now to know that nature hates gradients," and you look down in shame because you have no idea what he's talking about.
Lol
Raneem Hamada osmosis, diffusion, electrochemical gradients in photosynthesis and respiration and just basic equilibrium. You do you know, it just didn’t click till later. Dw
Gradients are just differences basically, and nature loves equilibrium. So he just means nature always tries to find balance AKA no gradient
it might help if you look up the word "homeostasis", but I can tell you're just trying to add a fun commentXD
JusyClouds I thought this was a fat joke, I’m now proud of my eq
On average 10 minutes of crash course is equal to 5 hours of regular class. You are a true hero Hank.
Those 11 minutes were literally more useful than a two hours class. Can't thank you enough.
I always wondered what happened in my nerves when elephants crawled across my knees.
Are you selling "Nature Hates Gradients" T-shirts? I would totally buy one.
+Alicia Barrenger please
i need em'
@@alessandraristerportinarim5214 You don't need them. *You want them*. All you need is air, water
and nutrition.
@@wasimmunshi429 you're so right
@@wasimmunshi429 and Jesus
07:43
When I finished the video I was kinda in a hurry and I hit my toe across the door. I was like
"The current is currently flowing in the axons now bear with it repolarization is coming and you won't feel the pain anymore" haha
Thanks a bunch for the the effort :D That helps a lot.
I'm so glad this channel exists. I have no background in science whatsoever so you'd understand the initial shock and confusion and despair i was in when i studied these topics. Text books are so confusing and hard to read! Thank god for Crash Course #Atleasticangetapassnow
God doesn't exist.
You don't exist.
+Andy Wang
Nothing exists, only perception and theory
I like need to borrow your brain for this exam I'm about to take. Do you mind?
same
I bet you will end up writing "Biology hates gradients" lol
How did the exam go?
I'm dead but still alive college is a thing
Approximately 85 times better than my school notes/text. Especially because you explain things like the myelin sheath and sodium potassium pump in context with the rest of the things that are happening in the cell - THANK YOU CRASHCOURSE
You've literally made the university courses that I've taken and made them more intuitive, brief, and appealing. I can't believe that people end up thousands in debt when they literally could've just watched CrashCourse on youtube to get the same information. You're doing a great work here and you have my respect.
bro how did this guy managed to fit in a week worth of my physiology classes to a 11 minute video 💀 and I understood it better 💀
you are a wizard my friend
Thank you I needed this for my psychology test! It was difficult to understand this in my text book.
+Tiffany Amber Heh that's funny, i'm watching this for my physics course.
+Tiffany Amber me too
+Walsh2571 I'm watching it for neurophysiology :-D
+MDrummer Anatomy here :P
+HubyAnn Physiology herrre C:
Still helping students in 2019!!💗💗💗
You literally just taught me more than my A&P professor. Thank you so much king
I’ve watched this at least 15 times in the last 2 weeks for my exam. It’s just so much easier than to read a book that never gets to the point, or to listen to a professor who glazes over it. Thank you!!
QUESTION: After hyper-polarization, how does the Na-K Pump restore balance (I mean increase the positive charge inside the cell), if it throws out 3 positive ions out of the cell and brings inside only 2 ? Shouldn't it make the insides of the neuron more negative ?
ANSWER: When the inside of the cell becomes more negative than -70mV, then the sodium channel which is closed starts leaking and more Na+ ions start entering the cell due to the strong repulsion between the positive charges on the outside (Note: Even after the sodium channels open and close there should still be a lot of Na+ ions outside the cell than inside). So the leakage in the Na+ channel makes the inside of the cell more positive while Na-K pump makes it more negative. Both of them work together and maintain that sweet spot of -70mV.
Hope this helps. Have a good one.
Sudharsan V J
THANK YOU
Vlogbrothers and Co. have begun something truly wonderful with this channel. Crashcourse is one giant leap toward the democratised future of knowledge which the Internet has promised to deliver since its inception. I struggle to express the admiration and gratitude I hold for all those who contribute toward the project, including the subbable base.
what
This is the video that got me into biology, I'm a computer science student and I find it so interesting how the brain interprets code just like computers.
Obo DOS I know right! When you look at that and DNA, the parallels are eerie ^o^ I want to get into neuroscience, and use it to develop artificial intelligence
It should be the other way around.
Teya Logos yes’m
I'm so sad I only discovered this channel the night before my exam!
Same!
how was your exam?
This is so selfless! Hank (the man In the video.) decides to spend time educating others on this channel when he could be making million as a chief professor in biology! Thanks Hank!
Hank! My Hank! You have got me through some very hard exams...very well I may add. Thank you. I would be lost without Crash course. You guys are selfless and wonderful. Now my daughter is really interested in science, she is using you guys to look up questions that her teacher cannot answer. I cannot thank you enough. You are awesome. Keep up the fantastic work.
As an FNP student, I just have to say thank for you really breaking down this complex subject. I haven't taken an A&P class in over 10 years, so this is such a good refresher. My professors suggest these videos for their students to review because it is explained more clearly than a dull textbook.
I am taking a biology class for my nursing degree. Once I watched this everything clicked for me because i couldnt get this concept by reading it in my text book and such. thanks Hank!
The whole "Nature Hates Gradients" bit made my day, 10/10.
I'm taking AP 1, and this 11 minute video makes more sense than a 2 & 1/2 hour lab lecture.
ilysm
If it wasn't for these videos I'd definitely be failing Monday's biological psychology exam. THANK YOU! You make this understandable 😱
Yes it's easy enough for an 11-year-old person to understand or me I love AP
I'm with you! I'm studying for Bio Psych course too and these videos are a life saver!
girl im taking biopsychology right now and my first exam was literally today, this is a life saver 😩🙏
like buttons aren't enough, i need to click a love button.
but don't we all.
sheepwshotguns same
This 11 minute video has helped me more than my past 10 weeks of biology class. Seriously, you guys do such an amazing job. I'm definitely coming back to your channel to help me with my biology and chemistry
My teacher is a physicist. He wrote the biology portion of our textbook in the hope that the biologists on the team would rewrite it. They did not. So, in order to understand this concept (which he admitted is too hard and boring for even him) I turn to you, Hank. Thank you. You save my bacon.
These video's are of superb quality, everything from editing, to explanation and even that nice studio.
Downright amazing.
When you get the "a-ha" moment with Hank.
I feel so much well-informed and confident to do my tests when watching these videos. Learned more in these short few minutes than any lesson or textbook. Thank you Crash Course!!!
May God bless you for keeping this free!! I am doing my graduation through correspondence(homeschooling) and this has helped so much! ! Honestly I dont need classes at all because I have you guys to explain me things better than professors!
Keep up the good work! You got the blessing of millions of students!😇
This has been really helpful while taking my Anatomy & Physiology class in college. It helps me understand my textbook so much better!
You sir are a legend, i get assignments.... i youtube you. For this i salute you.
I'm in 6th grade and homeschooled. I love watching you biological videos as they are amazing and easy to understand! Thanks for your posts!
Being a computer engineering major, i find this absolutely facinating to actually be able to understand how this works. Excellent explanation.
Can I just point out how beautifully and excitingly you explained these concepts... Thank you
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
awesome! thank you!
This is amazing, thank you for making them even after 5 years. You all are awesome!!
CrashCourse are you from heaven? ♥️🦄
surprisingly enough, this 'app' function he refers too, is exactly how touch displays work on smart devices. I remember reading about it. Touch screen displays use Action and Potential sodium and potassium charges to manipulate the on screen icons.
I can't believe how well everything was explained. Those animations are awesome. The way the content is organized it's great. When I have to read about different topics for university it's difficult to understand how everything connects together, but here the script it's so clear! At the end everything makes sense.
I freaking love this show, It's just so pure and educational and fun to watch. I hope y'all will keep up the good work!!
This is amazing, you guys helped me pass my anatomy exam a and you´re helping me with physiology. Big massive THANK YOU !
I'm forever grateful for you. My future kids will definitely use crash course as a way to wrap up what they've read in text. I'm a proud science nerd.
i really don't need all the extra information that crash course gives while explaining stuffs, but that's the reason i watch u guys- I LOVE HOW U EXPLAIN EVERYTHING IN DETAIL and it helps so much clearing each concept!
I have been watching Hank since Biology 1610 and he helped me pass for my second time since the first time I had no idea what my teacher was saying! He explains it so much better in less time! Now I am watching in Anatomy and getting amazing help from him once again! Thanks, Hank and everyone else in crash course! :)
Oh no! A cliffhanger! Or should I say...synapse-hanger? Yeah? No? Cause...the charge is hanging on the edge of the synapse, ready to jump the cleft? No? Okay.
*weak applause?*
Crickets.... Then roaring laughter and applause.
Points for trying friend.
:'D Thanks.
ibtihaj chowdhury It's the thought that counts...or moves across the charge gradient! *badum-tssss* (take this power away from me!)
Thank you so much! been struggling with this so much in my A Level Biology but you've explained it so well and made it so much easier to understand. Thank you
You are making me feel more comfortable when I see my lecture notes. I have a better understanding of action potential!
Damn man we use you in class because of me you are loved more than you know keep making amazing videos forever❤
I know every one does this but THANK YOU FOR HELPING ME PASS A+P.
I love Crash Course!! Thank you for another tool I can use to aid in the understanding our amazing and complex body systems.
You guys are amazing. I sometimes watch your videos multiple times. First time i just watch it at .75 speed, second time same speed, but i take notes and last time i just watch it at normal speed.
Your channel is SO HELPFUL and descriptive, keeps my mind engaged. Thank you
I am very excited about crash course kids! I have been wanting to share these with my 5th graders, but they are too advanced. I can't wait for these!
We're seriously excited about it. :D
kids totally deserve this, it'll be like their Bill Nye
eggplnt hi random teacher
excellent work has been done by your team... each and every detailing and explanation is just efficient...
comparatively bestest videos and easy to understand... everything simplified
This was so interesting! Yes I feel nerdy but it feels good lol. I've always had trouble remembering/understanding this concept. Thanks!
Love this guy... "this is action potential, in action" lol
Have a BME exam tomorrow and this really helped me understand. Thanks!
I've spent hours/days reading about this in my anatomy book, and this made more sense. Thank you.
makes all this complex info suddenly limpid clear and flowing naturally. Thanks a lot for this generous channel!
this is indescribable !! so seamless and clear
a true biology tutor is the one who let us in the true identity of biology which is intrinsically LIFE SCIENCE , this was so life and i could easily relate it to my actual neuron activity !!!!
I'm learning this for my brain and behavior class. It's for my psychology major. Very hard class.
I love Craah Course I was struggle with Physiological Psychology but no more. Thanks for helping me graduate
these graphics are EVERYTHING in understanding this kind of stuff, makes it so simple and so fun to learn! wonderful video, as usual!
thank you so so much for making this clear to me ! I honestly learned from you in those 16 minutes more than my instructor 14 Hours.... thanks again, God bless you ❤
I love how I'm getting an entire crash course of my exam 2 hours before I take it and learning better than I ever did in my lectures
Thank you - I was so close to giving up on studying this - you made it 100000 times easier for me to study !
I am so grateful for you, your brother as well and a crash course crew. Your videos are phenomenal and a gift to students. Thank you for your hard work to help educate so many. My entire family is fans as well❤. I cannot wait to graduate and financially support you all.
I can’t even believe how easy my life has been since crash course met my college days; how the hell do I thank you hank!? Saving my life here, breaking it down to what I can understand as always 🙏😎🥂
Thank you CrashCourse for making this make sense, entertaining, and memorable! I'm going to school to become a teacher and am very excited for crash Crash Course Kids ! Thanks so much for all the hard work you peoples do to make quality videos.
p.s. I do believe in God who design our complex body, world, and universe. Science is discovery and understanding how things work. The chances for a single cell creature to form out of nothing is astronomical. It takes a lot more faith to believe in the big bang than a God who designed the universe.
The best explained video I have ever watched.. 👍👍
I am stress from biology class but can’t deny that biology is amazing, there are many things you need to learn and also be grateful to the scientists. I think one of the method of doing well in biology class is learn to love biology.
Thank you!!!! You literally saved my life. I tried to learn this chapter like for months but his lecture made is so much simplified. Thank you!!!
Thank you, Hank, for helping me remember how the action potential works for my neuropsychology test tomorrow :)
Awesome, I've seen some children around, so tomorrow I'm going to take my windowless white van and go tell them all about Crash Course Kids!
lmao
HEY! Our moustachioed and oddly touchy band director has been missing a van just like that!! You didn't steal it, did you?!
Madame Catfish Oh, you mean Fred? Errr... I mean... no, of course not. **whistles nonchalantly**
Headrock I'm calling the police!The nonchalance gave it away kiddo
Weird imagery
You always make things easier to understand than my professors. Thanks Hank
Hats off to you! Highly informative, entertainingly presented, well produced etc etc. thankyou.
Love this!! Thank you so much! I just discovered this and i think it's fabulous. I agree that there is a certain level of knowledge that it's helpful to have before viewing, in order to get the full benefit and truly appreciate the levels of humor etc. Rock on! (or should I say, "propagate on? !)
Teacher took 2 years to try and explain his; got it all in just 10 minutes. Thanks, very helpful.
I really enjoy your tutorials
Omg this was very helpful. Thank you to who ever created this masterpiece of a channel
It's a perfect speed. If you u press pause, I can take it all in and reinforce it. Thank you, for speaking quickly. Nice work.
Love the little animations on the side, and this makes learning so enjoyable!
mega thanks, hank!! i am studying psychology and i have a vocab quiz tonight and a test tomorrow. i had no idea what the heck any of this action potential stuff meant, and now it's super clear!! once again, thanks a ton!!
This was incredibly helpful. I've got a big neuropsych exam today and this covered everything I felt unsure about.
This guy is Awesome! He explain things so easy no matter the science
omg i love him, this is so helpful xxx
Thank you so much for these videos! I loving learning and your team makes it so easy to do so.
I seriously would not have made it through my biology class if it wasn't for this channel. Thank you so much!!!! You explain these concepts so well
Watching this I really hope my neurons are that happy
Love Crash Course!!!!
Thank you!! This was so helpful!