Tissues, Part 2 - Epithelial Tissue: Crash Course Anatomy & Physiology #3

Today on Crash Course Anatomy & Physiology, Hank breaks down the parts and functions of one of your body's unsung heroes: your epithelial tissue.
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 00:00
Proper Epithelium & Glandular Epithelium 1:38
We're All Just Tubes! 2:12
Cell Shapes: Squamous, Cuboidal, or Columnar 3:34
How Form Relates to Function 4:15
Layering: Simple or Stratified 5:26
Epithelial Cells: Apical & Basal Sides 7:06
Glandular Epithelial Tissue Forms Endocrine & Exocrine Glands 8:20
Review 9:16
Credits 9:54
***
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[@Romanticoutlaw]

this might sound a little silly, but I'm going through a rough emotional time right now and watching cold hard science interspersed with cheesy jokes really helps me move my focus away from harmful things. Thank you, Hank.

[@MrEverisforever]

Actually helping me right now lol

[@wzwguitar]

same!

[@XxAlex530xX]

same here.

[@jacquelineS9]

Im crying while trying to study:)

[@chigo999]

never give up!

[@yourmomjay]

Crash Course should have PDFs for "end of lesson" tests. That would be another great way to keep all this beautiful info inside mah head.

[@user-cm2hb5kq2k]

Yes definitely

[@michelleculpepper4169]

Yes, I completely agree!

[@karterfehr7388]

Yes I agree also

[@PrecociousSloth]

Making your own tests is a great study tool. Just take notes during the video and create a test

[@PhyrexianSwarmlord]

@@PrecociousSloth same boat!

[@sudharsanvj8531]

Notes: 3.Epithelial tissues Two kinds: PROPER/PRIMARY EPITHELIUM (covers & lines the outer and inner body) and GLANDULAR EPITHELIUM (forms the glands and secretes hormones & other substances). Epithelial tissues are Avascular (not associated with or supplied by blood vessels). They instead rely on the blood supply to the Connective tissues around them for the materials they need. Criteria for classification of Epithelial cells: Shape of the individual cells and the number of layers that they form in. THREE BASIC SHAPES: SQUAMOUS cells (flattened shape and flat nucleus, fast absorption and diffusion, making thin membranes). CUBOIDAL cells (spherical nucleus, cuboidal cell shape, absorb nutrients and produce secretions like sweat). COLUMNAR cells (Elliptical nucleus, column shaped cell with hexagonal cross-section, tall, thick & cushion underlying tissues, absorb nutrients and produce secretions). Usually the form (shape and layering) of the epithelial cell is related to it's function/purpose. Producing cells take a lot of time, energy and raw materials. So in places where we lose a lot of cells (like outer skin or mouth) we have squamous cells because they are biologically cheaper. TYPES OF LAYERING: SIMPLE EPITHELIUM: one layer of cells. STRATIFIED: Multiple layers set up on top of each other, like bricks. PSEUDOSTRATIFIED: Mostly one layer but formed with cells of different shapes and sizes. The cells nuclei can be at a lot of different levels (i.e they don't lie on the same plane- different heights). So it looks like multi layered. NAMING OF A EPITHELIAL TISSUE: First name: Number of layers. Last name: Shape of its cells. Example: Simple squamous epithelium. All Epithelial cells are POLAR i.e they have distinct sides. The boundaries of many of these cells are 'Selectively Permeable'(Allowing for some level of absorption, filtration and excretion of substances). Example: tissues lining the small intestine allows absorption of nutrients through diffusion and active transport. This is what makes possible all interaction we have with the world since Epithelial cells line both the insides and outside of the body (U Tube) . GLANDULAR EPITHELIUM forms two different types of glands: ENDOCRINE glands (secrete hormones directly into the blood stream or to nearby cells) and EXOCRINE glands (secrete their juices into tubes or ducts that lead to the outside of the body.

[@katan.1480]

I should give him my tuition money instead! he's so helpful

[@HitanshuTheBoy]

he will be very expensive that you wont be able to afford it, sorry!

[@garv8438]

@@HitanshuTheBoy lol

[@HitanshuTheBoy]

i wont, he is too annoying, i wish he could slow down his speed

[@quochuyhoang9764]

@@HitanshuTheBoy that's why youtube invent 0.75 speed playback dude

[@rayamoooooo685]

@@HitanshuTheBoy oh no, please no AP classes.. We would be stuck on a 1/3 of the lecture with you..

[@cynthiarodmusic]

Nursing student here...thank you!!!!!!

[@generated28]

Selene R IK this is late, did the videos and the passive learning they're supposed to help with make the class any easier for you? Or was it mostly book and notes and class and this just helped reinforce core concepts? I'm about to start my classes and wondered how it worked for you..

[@rubeng9649]

A hot one too ;)

[@jwho4273]

Emt B Crash Course can teach you the general or the big picture, but I found with the course and labs it showed the application of the content a lot better. To study I actively learned the definitions and big picture elements. Does that help?

[@MrEverisforever]

How did you go?

[@sujiewansuj3788]

ruben ew

[@urishima]

He looked so pleased with himself when he made that KZbin joke... I wanna give him a cookie.

[@kariwithlove]

I pause it every 5 seconds to take notes (because yes you do talk very fast) but I already learned so much more than listening to my teacher blab on for 3 hours. Thank you so much!!!!

[@maeve_zahra]

My teacher keep trying to explain this to class for a month and while I get the basic, I don't get the whole idea but it only took you ten minute to make me understand wow, Hank... thank you so much!

[@tigergirl305]

I remember in high school, teachers would show us these videos. I could never really understand them or appreciate them. Now I'm in college and have found that this is my way of studying. The textbook is too boring and I space off every time I open it, but this keeps me engaged and summarizes very well without any unnecessary details. Thank you, Crash Course!

[@CrazycruxGaming]

weird thought, but i absolutely LOVE the art style in his diagrams. it is very sleek, stylishly simple, and easy to remember.

[@ShinoAburame37]

I'm a giant science nerd, so these science-based crash course series are absolutely outstanding entertainment! Thanks for making them, and I urge you to continue with more fields of science, like Physics!

[@missc2742]

Woo! Physics!!

[@suchizinzuwadia3527]

that "you tube" joke was great.

[@queensaharaice7376]

Ikr 😆😅😄😂😁😀😊lol!!

[@howardxing5885]

yup

[@FellipeCalleia]

amazing

[@nasavirtualgroup3483]

His science is only a joke..😆😆😆

[@TheSmileycup]

God bless you guys! Seriously! I'm a freshman nursing major and these videos are helping me understand my A&P material. thank you, thank you, thank you

[@mccloskey_0119]

Sarah Nystrom hey how’s your studying going? Are you in the program now?

[@emmad.1110]

THANK YOU FOR CLOSED CAPTIONING THESE CRASH VIDEOS :D

[@crashcourse]

We got a little behind for a while, but we're back on track! Always happy to make education as broadly accessible as possible! -Nicole

[@igorandrejic9809]

+AceTrainerGirl I've been studying anatomy and found an awesome website at Anatomy Blueprint Pro (google it if you're interested)

[@valm6674]

There are many factors in learning anatomy. One plan I discovered that successfully combines these is the Sebs Study Crammer (google it if you're interested) without a doubt the most incredible course that I have ever heard of. look at this awesome website.

[@sophiasardi6386]

+

[@hassanamar8867]

ТТThеееe Reаl ED Curee is ovеr 300 Yeeaaars Old! twitter.com/6b32c5ac996d61862/status/804602507225808896 Тissues Раart 2 Ерithеliаl Тissue Crash Cоurse A P 3

[@BreBreLalala]

Okay, so I just want to say that years ago I wanted to learn all of this and go to uni. I did some reading and my brain almost exploded, so I came to youtube and still, couldn't wrap my head around ANYTHING. I never pursued any science-based career. Fast forward to now, I am ENJOYING watching all of these videos, I am glued to the screen and loving it! I am looking forward to applying to study a science degree, so THANK YOU! So so grateful for your knowledge, fun presence and interesting analogies haha! Theeee bestt!

[@jessicapolito3491]

I totally forgot how incredibly exhausting, yet entertaining and helpful, your online crash courses were. This channel was able to help me pass several of my science and health classes in middle school and high school. Now your videos are helping me understand anatomy and physiology, so thank you. I was only able to watch 3 videos in a row today, but I am going to try to watch the rest of this crash course throughout the next several days.

[@jacquelinefee]

I'm taking biology this semester and it has not been a walk in the park to say the least. But, thanks to all your video's (including SciShow), I'm passing the class with a B! I, as well as everyone, really appreciate all the work you and your staff do! Thank you :)

[@moronicfrog9090]

summary: so in short your epithelial tissues are the outer and inner boundaries that keep everything in order. their are 3 types of cells squamous= squished and needs multiple to make a thick layer and you are able to lose some and be ok. cubodial= cube secretes things and columnar are colum lile and also secrete things. stratified means have more than 1 simple mean just having one layer and pseudostratified means looking like it multiple but it is just one layer. the top is apacal or the surface and the bottom is the base. also epithelial tissues have no blood and are polar

[@Xenro66]

I'm not remotely interested in anatomy or physiology, but when it's taught by Hank, I just have to watch it because it's so epic :D

[@doulacandice]

These videos are gold. Nursing student here, they help us so much.

[@DontMockMySmock]

Hank putting his fingers into an "invagination" made me chuckle. I am a twelve-year-old apparently.

[@Koolguy5465256]

DontMockMySmock THANK YOU. i thought no one else was gonna say anything about the script almost going there

[@GC13]

Did any balloons get popped during takes for that scene?

[@NuuStar]

I was about to ask for bloopers!

[@crashcourse]

Abby Gonzalez Bloopers are coming in a few episodes, but no, GrandCommander13, no balloons were harmed in the filming of this episode ;) -Nicole

[@GC13]

CrashCourse That's good to know. No one wants to see any balloons get hurt. :-)

[@AnimatorEnthusiast]

GrandCommander13 :^)

[@kariskir1]

+GrandCommander13 That scene helps prove rule 34.

[@harresdirksen1950]

It would be very awesome if there was some kind of test or questions about the material that you guys teach! :D

[@RianKashfi]

+Harres Dirksen That would actually be pretty awesome but we'd need to make sure we donate enough to patreon or subbable or whichever it is to make sure they have the necessary funds to do so. They'd be like Khan Academy, allowing us to test our knowledge as well.

[@sophiaakua1561]

@@RianKashfi yeah and you can also test yourselfe

[@lynns4122]

It would. Though Khan Academy as tests on pretty much the same stuff

[@igotVoldemortsnose]

This channel is saving my life, even in university! USE THIS RESOURCE TO LEARN AND REVIEW GUYS!

[@Zeldaschampion]

I have this feeling there were a lot takes with Hank catching that balloon.

[@crashcourse]

Maaaaybe a few... -Nicole

[@Zeldaschampion]

Had a feeling that was no one shot deal.

[@benaaronmusic]

CrashCourse Hopefully some great outtakes to look forward to!

[@Aquafairy828]

I have been an avid Crash Course watcher since my freshman year of high school in 2008. I am now in my last year of pre PA headed to PA School. I have watched John's CC History along with Hanks many courses of the Sciences! Currently refreshing for exams, and this been the funniest episode by far! I love your shows so much; thank you for all the years of help and education!!! Your channel will always have my continued support and recommendation to other students! 💙❤️

[@DakuHonoo]

this is the first time i couldn't absorb all that info, probably because it's my first finals and this has nothing to do with physics/math ... it made me realize how great this form of teaching is because i can just play it again... i wish i had something like this for my physics and math classes

[@TheDrawdex]

Let's wait for Crash Course Physics and Crash Course Math then. No matter when it comes, with this kind of teaching this knowledge will be useful.

[@DakuHonoo]

Draw dex yep, i'll watch it even if it comes 10 years from now ... it's just that i'm giving up physics because i don't have any willpower/discipline for self-study that's required, i'll just finish the next semester and move on to programming ... i'll be always interested in physics, just not enough to get a degree in it because when i started studying it, the amount of math was overwhelming and i totally lost all interest....should have gone for coding from the start

[@TheDrawdex]

DakuHonoo Then you're not being taught well, or just being told what to remember to do something, and not why it's used, or where in the real world it's naturally done. I'm studying Electronic Engineering, and the math and physics involved comes naturally, just as well as the coding and making of the hardware. It's overwhelming if you see it at the big scope, but only because of the time it has been refined and re-mastered by many people that way smarter than I am, and it's long as tree branches to even end one problem. What I mean to say is, it's hard when generalized because it's hard to picture; relate, or even fathom how this works if it's being told, not shown or explained. But if anyone that has watched Crash Course has learned, when organized, well divided, and calmly exemplified, any subject can be taught to a level of understanding, not only knowing for the next test and make the teachers look good and you learn nothing from it. And coding by nature, there's no natural rule to many things, ingenuity yes. Reason? Not so much. It was just a designer's nick to do it on one way or the other, and THEN you will be overwhelmed, unless organized, well divided, and calmly exemplified. Good luck though. :D

[@DakuHonoo]

Draw dex that's very nice of you but you're wrong ... i used to be great at math, the numbers, formulas would dance around until they fit in their place and an answer would show up...that's not happening anymore... also, i'm not studying engineering but physics, there's a bit of a difference, like i had 5 math classes covering 3 different categories? at once...it's my fault that i don't try but i lost both motivation and confidence just before i enrolled and with the kind of approach i'm not fit for a university ... i have a distinct feeling that i'm becoming a failure....and it all comes down to me never being able to motivate myself on my own... i've never tried my best for myself, only for people i cared for a lot...now i'd love to be able to... i'd love to listen to all those people who say to try my best, to just keep on going... i can't ... that's why i'm going for IT, because from my perspective it's easy, i honestly don't know anymore where i found the confidence to even think i could become a physicist, especially knowing that i'd always go for the shortcut, to try the easiest way possible

[@DakuHonoo]

Draw dex also, i am being taught well, my teachers, professors, are great and about half my class is managing it pretty well, so i can't conclude anything else than the problem is in me

[@Phalhell]

Thank you. This is included in my exam next week. Like you guys knew that I had an exam :)

[@crashcourse]

Totally. We planned it that way and everything. -Nicole

[@livinusngonyani8724]

CrashCourse

[@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

[@DeeGil]

I love you.

[@clairedelune600]

Dear Hank, Please please please make a crash course for the AP Calculus courses.

[@malharnagori5221]

man... this is SO MUCH BETTER THAN BOOKS ( i mean, the books are not as interactive as Hank)... please dont stop PLEASE. Hank, you are amazing

[@pepi-memes.allday1302]

Without you I'd never pass anything in college. You break it down so simple. To learn the most complicated stuff you have to have a good strong basic foundation. You help with those foundations. ID FAIL WITHOUT YOU!!!

[@PorkChopper449]

13 years old and loving this channel already

[@LargeClassicPoop]

Thank you for this series! I'm currently taking A&P 1 and this is lining up perfectly with my course. It's nice having another tool for studying that isn't painfully dull. (I think the problem is that the books forget to properly illustrate that the cells have faces :P)

[@Badpalval]

I can't stress how much you guys help! I was reading my book, labs, & PowerPoints and I still just wasn't really getting it. You guys take it to a whole new level. I now have a better understanding of all this. Thanks so much. Now back to rewatching all these videos!! :-)

[@Tornair]

These videos have been so helpful in classes. As soon as someone mentions a type of epithelium, I picture these animations with ease! Thank you so much!

[@tarawilson9076]

THANK YOU!!! These videos organize all my A&P material in a way that I can actually understand, now I have a staring point for studying. Plus the videos are are funny, which make it NOT BORING to watch, very much appreciated!

[@sccm100]

Thank you Hank Green for existing!

[@laitanwulf]

off topic but you catching the balloon without looking was pretty cool just thought you should know

[@BCKunoichi_]

I doing college anatomy and physiology right now. I’ve been so stressed just reading the textbook over and over again. These videos have really helped my understanding of the subject and made it interesting. Thank you 🙏

[@andrewfirth1497]

Watching this makes me think... There is so much stuff to go wrong

[@owenchristian4111]

This is very brief, funny and helpful. Best lecture ever. Thanks CrashCourse!

[@tameramaes9281]

Just as I was leaving to cry in the shower over my first A&P course, I found your videos. THANK YOU

[@bharathsri6089]

Am just an 11 year old and I understand this stuff. After passing my 11+ exams, I am practising for my GCSEs. I also watch other Crash Course series like: Biology and Chemistry. I understand everything because you explain it so well. Thanks!

[@jaimewilson9140]

So glad you're doing Anatomy and Physiology Videos!! Makes my teaching life a lot better. Students enjoy the videos. Thanks : )

[@crowsong8097]

Pushing on the balloon like that made me so nervous, lol

[@patrickrichardson7965]

I'm a Kinesiology major an am taking Physiology 101.So I learning more as a teacher coach pupil. Thanks 👍 Hank.

[@Cookierabbit95]

It's so clear when you speak that even if I'm French and it's going very fast, I can understand all of it ! Thx for all ! It's much more fun like that !

[@lprocks555]

Can't wait to see the outtakes of the balloon explanation.

[@4Nn1E]

YES

[@xiandiv9549]

Damn I love this guy, he makes almost every complicated topic like a basic english.

[@Alexitis]

I love the animations of all your videos!!! Like the little you being thrown out... Right on your desk! Hilarious, makes me enjoy what I'm learning. (or rather reviewing) Thank you!

[@jhackelinemiller5419]

i freaking love these videos. they make the most in depth concepts seem easier.

[@JacksonReynolds]

Brilliantly done.

[@kyhumps]

glee gym teacher :)

[@roneyandrade6287]

favoite "cameo" finn from adventure time in psycology

[@Thought-Cafe]

kyle humphreys Nice catch :)

[@maddiehanley4810]

yeah i was like, "is that sue?"

[@twilightdisneyfan101]

+kyle humphreys at first I thought it was Hillary Clinton.. then was wondering if it was on purpose or a coincidence....

[@ferhatkoksal6513]

It was sue i saw it too (and that rhymes)

[@makinggood1169]

Cool video! It was really helpful to see the comparisons between different types and organizations of cells. I was having trouble picturing it from a written description.

[@msdestructo]

I'm so glad you guys decided to do a segment just on H&P. I love y'all.

[@baad5283]

Im from Poland and Im learning with it :) its really helpful! thank you so much!

[@EmperorTikacuti]

Thank you God for giving me unique tissues that protect my body. Again, thank you My Lord.

[@SarahGeo]

Thank you, CrashCourse , for helping me pull through my test! Let the videos keep coming!! Love 'em!

[@rapmiro8295]

أنا عربي وقد أعجبني شرحك للانسجة الظهارية شكراً لك جزيلًا هذا سوف يساعدني في الامتحان غداً I am an Arab and I liked your explanation of epithelial tissue. Thank you very much This will help me on the exam tomorrow 💜💜💜💜

[@miciarokiri5182]

That laugh after the "you tube" pun was amazing, So freaking adorkable.

[@mrannunaki6852]

hahaha...... That laugh after "youtube"

[@durahnajjar5490]

this is legit THE best explanation ever omg

[@Paavali-li7sz]

This video is great and very well structured! Thank you for existing!

[@scifugitive2]

Poor thought bubble Hank! I was kind of hoping someone would help him when he was thrown onto your desk in a trail a goo.

[@rafaelstevenson]

please do a physics crash course

[@rohanarcot2955]

+Rafael Stevenson good idea

[@luzperez4759]

Yes!!!! Physics would help a lot if they start now. :/

[@DataExpungedNull]

Physics is going to be released *soon*, I think end of March!

[@rafaelstevenson]

silas qwerty​ reallyy? How do you knoww

[@DataExpungedNull]

+Rafael Stevenson They mentioned physics is going to be released several times, including in youtube comments and their tumblr page! I also think they said end of March but I could be wrong.

[@allisonabuchman]

Just wanted to say THANKS for mentioning lactation in this video. I always watch your channel while I'm pumping at work and I got a kick out of that mention :)

[@bryanfeliciano4102]

My ems instructor just sent me a 46 video Playlist 😂, and said "make sure you learn this". Thanks for making it easy to understand.... My head would explode otherwise

[@Matt-pr1xv]

Anyone else just have a flashback of Offspring's Come Out and Play (Gotta Keep 'em Separated)?

[@craftanimal123]

bro, i love you

[@Nao0rLater]

I looooove these videos. Thank you Crash Course for making this channel. Makes relearning anatomy and physiology fun!

[@stephaniewilliams7992]

Explained very well......plzz keep on uploading such informative videos🖒🖒

[@derpinglyyt6285]

"Haggling over tater tots" Lunch every day at school

[@seanhaight2551]

"You gotta keep em separated" - the Offspring.

[@jaketravis]

Been having trouble getting motivated to study for my upcoming exam. This is helping. Thanks.

[@kylerglover3477]

The anatomy videos are the best for my college anatomy course! Thank you so much for making these!

[@OscartheAwesomest]

I'd love to see a European History or Crash Course Ethics

[@denefiewalton6422]

2 hours before the exam. Here I am!😂

[@zeroamericanhero]

Thank you for making Crash Course! I have literally watched all of your episodes. I am stationed overseas, and I do not speak the native Turkish language...I watched these as not only for entertainment but as a refresher so when I go back to school I will not be far behind. FYI I love The Fault in Our Stars.....and I am not into tear jerkers movies.

[@PepinoMichoacan]

Thank you so much ! Working for finals made easy, quick, efficient and fun ! I love you guys.

[@DFZero235]

This entire series is literally just a whole truckload of happy nuclei. :D

[@Dandalf_the_Fly]

why is there tater tots on taco Tuesday

[@novathemagus3740]

You should always have tater tots, no matter the occasion!

[@MrTridac]

because it's totally trendy

[@MrTridac]

because it's totally trendy

[@laurensweeney8364]

I really hope this helps me on my A & P Exam tomorrow!!!! I've been watching these for a little bit. They are a cute way to learn ! Love it. Keep it up guys. Wish me luck!

[@Hearteeisawesome]

Omg I needed this video because I have my anatomy final tomorrow and I just never understand this unit!!! Thanks for saving my life!!

[@moriahwilliams1787]

Took my teacher 3weeks and im still lost, 10min with u n im a freaking wiz

[@krishelpanlilio4313]

I wonder how it'd be like if my brain was squished between my kidneys😮😂😂

[@aliciacusack9468]

I really wish my teachers would have made use of these videos in class... Even if English is not my first language this still makes a lot more sense than my text books ever did. I'm in my first year of university studying BSc and I think the only reason I was able to get the grades I did for science and biology was (and still is) thanks to you guys !

[@triyasmith4519]

I LOVE these videos! You don't speak too fast for me because I'm listening to what you're saying. Very informative!! You're hilarious too!

[@Skylos]

3:33 Layers... OGRES HAVE LAYERS!

[@buddatobi]

Can't argue with that

[@blu8993]

Lol shrek

[@shaisis]

Glad others thought of saying it.

[@skyblue6832]

So, wait, are proper and primary epithelium the same thing?

[@skyblue6832]

But if it is to line, then it would protect as well, right?

[@doctorabdirahim9515]

yes they are same and as well they protect like stomach epithilium (simple collomunar epithilium) secrets mucous to protect from acidity that gastric glands are secreting.

[@kelving]

Love CrashCourse so much! Keep doing what you're doing, guys!

[@tallystone1581]

Fantabular! These vids are a students dream. Not only is the film and animation top notch quality, the information is delivered efficiently and with an appropriate dash of humor. The information sticks to the vitals and is easy to digest. Great job guys and gals, thank you!

[@metrocityproductions7152]

If a dropout student watched all your videos 3x a day every day then he/she would most likey have a higher IQ then 82% of the public high school students....

[@BraighGaming]

That's not how IQ works.

[@writershard5065]

Not IQ. He'd probably be able to understand the information presented here really well than a lot of people in bog-standard school around the world. HE'd probably also feel really bad about dropping out and would wish to study biology if he's genuinely interested. (Why did I not take biology dammit)

[@metrocityproductions7152]

Still great videos.

[@Edgewalker001]

Writer Shard If you do, go for biomedicine instead of marine biology! XD

[@JBTDA]

***** what can you do with a biomed degree? I've heard bad things (such as, there are very few carer options and your options for further education aren't that many either) but i am really interested in things like this >_

[@rohanarcot2955]

so is proper and primary epithelium the same thing???

[@doctorabdirahim9515]

yes they are same.

[@Thomas_Winters]

oh. *changes notes*

[@rohanarcot2955]

Tony Winters xD

[@kimberlychapman9611]

Sherlock Watson same hahaha

[@shannonwilkinson1590]

gosh! I am obsessed with the animations. SO CUTE!

[@dane.seifert]

THANK YOU SO MUCH FOR YOUR VIDEOS!!!!!!! It makes so much sense now!!!! Your examples are AWESOME!!! The only problem that I am having is that I always get different types of tissues and where they are located in the body mixed up! For example, the simple squamous epithelial is for filtration in your kidneys etc and exchange rapid diffusion in your air sacs. But sometime I would get that mixed up with Simple cuboidal epithelial and where it is located. But over all, your videos are very helpful. Glad, I found you!

[@Thomas_Winters]

i should have started studying about two hours earlier....

[@AllisonLujan]

The whistle lady looks like Hillary Clinton

[@Graedreamer]

I think the person is the gym teacher from Glee. Sue Sylvester, I think her name is.

[@PatriciaPrice]

Glad I'm not the only one that saw that!

[@glowcat5691]

@@Graedreamer omg same

[@leeredmond6301]

I think I might just be able to do this.... You've made it possible, thank you all involved for these vt's. They're fabulous!!!

[@yangze2746]

he is like the best lecturer! amazing