Animal Development: We're Just Tubes - Crash Course Biology #16

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  • Опубликовано: 22 дек 2024

Комментарии • 1,4 тыс.

  • @KokoKoko-og1js
    @KokoKoko-og1js 9 лет назад +291

    "If there's anything harder than teaching people something, it's unteaching them something."
    Well said.

  • @faryaarshad9846
    @faryaarshad9846 6 лет назад +94

    layers of tissue formed in early stages of development
    morula: bunch of zygotes (after mitosis)
    blastula: hollow sphere of cell, round hollow ball of cells
    gastrulation: blastula starts to invaginate (fold in on itself) "blastopore"
    gastrula: 2 layer thick, outer layer (ectoderm), endoderm
    diploblastic: have two germ layers. same mouth n anus.
    we are triploblasts: mesoderm
    blastopore forms mouth: protostome
    blastopore forms anus: deutrostome

  • @randomtrucks
    @randomtrucks 9 лет назад +221

    We all share one thing in common
    In our mothers womb we all were once
    assholes
    Simply assholes
    Isn't that beautiful

    • @Nightraven26
      @Nightraven26 9 лет назад +3

      At what point were we just assholes? Because as far as my med school embryology goes, we have a cloaca which is later on, during the urogenital development, separated into the anus and urinary tract. So, afaik, we were never "just assholes"

    • @Nightraven26
      @Nightraven26 9 лет назад +5

      Also, the primitive intestine and the allantois (whose remnant is the urachus) come together in the cloaca. This video is educational, but human embryonic development is much more complex than this. Unlike animals such as sea urchins, after being the morula mammals don't become a blastula, they become a blastocyst, and after a process called compation, where outer and inner cells are differentiated, water follows ions into the intercellular spaces, and thus a blastocel is formed. The outer cells become the trophoblast, which is divided into the inner cytotrophoblast and the outer syntitiotrophoblast, which grows into the decidua of the uterus and later on becomes the placenta. The cytotrophoblast contains the embryoblast, which is comprised out of the epiblast, inside of which the amniotic cavity is formed, and the hypoblast, which creates the Heuser membrane, creating the wall of the primary yolk sac. Then it gets even more complicated with the extraembryonic mesoderm (or, due to historical reasons, mesenchyme), which divides into parietal and visceral parts and then combination of this and trophoblast forms the chorion, etc, etc. Gastrulation occurs in the epiblast, where the epiblast cells migrate towards the primitive streak, and in the process called invagination they are twisted inside, creating the three germ layers in humans - the ectoderm, mesoderm and endoderm. And then you have the prechordal and notochordal plates, but that's even more complicated so I won't go into that much detail. It's interesting, but quite complex to understand.

    • @armoda1057
      @armoda1057 9 лет назад +2

      Nightraven26 medical school education FOR THE WIN

    • @power2savenewzealand242
      @power2savenewzealand242 9 лет назад +11

      randomtrucks And some people have stayed assholes.

    • @power2savenewzealand242
      @power2savenewzealand242 9 лет назад +2

      randomtrucks And some people have stayed assholes.

  • @FraserSouris
    @FraserSouris 10 лет назад +770

    We started from the bottom, now we are here.

  • @thebrookster1
    @thebrookster1 9 лет назад +47

    Wasn't expecting the start of this video, hilarious stuff Hank

  • @FedJimSmith
    @FedJimSmith 8 лет назад +1397

    You = Tube

  • @aaaaammmmmyyyyyy
    @aaaaammmmmyyyyyy 8 лет назад +452

    I can die peacefully now, knowing that we were all once buttholes.

    • @suleymankhan5298
      @suleymankhan5298 8 лет назад +2

      hahaha

    • @ashleyjaden8698
      @ashleyjaden8698 8 лет назад +1

      +aaaaammmmmyyyyyy There's an art installation created by a Belgian artist that is a poop tube. It's a machine that literally produces crap. It's pretty hilarious: www.amusingplanet.com/2012/05/poo-machine-by-wim-delvoye.html
      Talk about art imitating life imitating art!

    • @nmubunny5975
      @nmubunny5975 8 лет назад +7

      +aaaaammmmmyyyyyy It really puts into context calling someone an asshole now doesn't it? lol

    • @saidabana9742
      @saidabana9742 8 лет назад +1

      omg my friend said that yesterday

    • @meow33_33
      @meow33_33 8 лет назад +3

      Actually, this is incorrect (despite the best efforts of wikipedia to support the view). The invagination in the blastocyst forms our navel, not our butthole.
      The human butthole forms from the cloacal plate, while the human mouth forms from the prechordal plate. Both open up separately into the by-that-time already formed "inner tube".

  • @kerokerobonita
    @kerokerobonita 9 лет назад +399

    That intro tho

  • @Shelinatorable
    @Shelinatorable 12 лет назад +4

    May I just say THANK YOU SO MUCH HANK! I have my biology final exam this afternoon and you're helping me to remember all the terminology. You are one of my favorite people, buddy.

  • @life42theuniverse
    @life42theuniverse 10 лет назад +152

    Who figured out the thing about the sea sponges and the blender? Some scientist was like hmm I wonder... bzzzzzz

    • @AniMerrill
      @AniMerrill 10 лет назад +40

      Probably the "Will it blend?" guy.

    • @Zer0_Flowers
      @Zer0_Flowers 5 лет назад +8

      life42theuniverse He probably wanted some sea sponge smoothie!

  • @simoneyuille8161
    @simoneyuille8161 10 лет назад +3

    I can't thank you enough. You've helped me in my history exam reviews and now sciences throughout his school, and I just want to say thank you.

  • @rachelk.6918
    @rachelk.6918 10 лет назад +207

    If Hank and John merged Bio and History... oh god...
    "So this goes to prove that you have a mouth, an anus, and cannot conquer Afghanistan unless you are... wait for it... a MONGOL SEA SPONGE!"

    • @DenkouNova
      @DenkouNova 10 лет назад +38

      >cue awesome montage of mongol sea sponges

  • @JonahPleatherbooth
    @JonahPleatherbooth 12 лет назад +4

    Hank and John thank you so much for both this Channel and SciShow. I've learned so much since you started them. I really appreciate it.

  • @potenvandebizon
    @potenvandebizon 10 лет назад +34

    When you said 'AAANUS' I just couldn't keep down my laughter.

  • @terminallyonlinezillennial
    @terminallyonlinezillennial 10 лет назад +94

    "...we were once just a butt hole attached to a little wad of cells."
    I want this on a t-shirt. Do you catch my hint (it's literally a demand but whatever).

  • @AwkwardPasta004
    @AwkwardPasta004 9 лет назад +98

    I love this opening!

    • @bowwing333
      @bowwing333 9 лет назад +11

      +InsideLauren'sWorld I was seriously questioning what exactly I was watching when I first clicked on this video. But it was pretty awesome.

    • @viveksinghchauhan7496
      @viveksinghchauhan7496 9 лет назад +1

      Overall it was a grand opening

    • @masterzedd4
      @masterzedd4 8 лет назад +2

      Dank Green returns!

    • @Phrenotopia
      @Phrenotopia 6 лет назад

      I didn't like it.

  • @harjashow
    @harjashow 12 лет назад +70

    "dude, no edge" *Whisper* "I know"

  • @rache1sc123
    @rache1sc123 11 лет назад +21

    I laughed throughout this episode. Sooooo funny! Keep up the good work Hank :)

  • @captainclark5726
    @captainclark5726 7 лет назад +6

    Hank u are an amazing teacher to me and other pupils that watch crash course so thanks for the help

  • @rebecagontijo7260
    @rebecagontijo7260 10 лет назад

    "If there is anything harder than teaching people something is unteaching people something." One of the best sentences ever.

  • @naota3k
    @naota3k 8 лет назад +66

    We're just like, tubes, man. Dude. The internet? Tubes, bro. The government.

    • @abbyroberts3
      @abbyroberts3 8 лет назад +8

      You-tube. Us-tube. We-tube.

    • @naota3k
      @naota3k 8 лет назад +6

      I'm like, mega tubular.

    • @eeesian
      @eeesian 8 лет назад +7

      Dude, no edge.

  • @tifelicity
    @tifelicity 8 лет назад +150

    'Mmm... juicy....morula pie... Oh God! They are gonna ban us from schools...' 😂😂😂

  • @Th3Clinch
    @Th3Clinch 12 лет назад +6

    @ 3:54
    Sea Sponges: "We're the exception!"
    *dramatic music

  • @fattonysullivan
    @fattonysullivan 12 лет назад

    I think you've finally dumbed it down enough that I'm able to understand a whole episode the first time through. Well done.

  • @Fletcher2k1
    @Fletcher2k1 11 лет назад +4

    "We were once just a butthole attached to a wad of cells"
    This single sentence has made my day.

  • @nfarley01
    @nfarley01 12 лет назад +2

    That was the first Crash Course that was all about things I didn't know :) it was awesome! I'm glad I got to feel clever so far, and even happier to feel that I'm learning new things now.

  • @kakashi_senseisan3931
    @kakashi_senseisan3931 7 лет назад +3

    Wow this is a great video. I'm a college student currently enrolled in Bio 211 ( an Intro class) and we're learning about Protsomes, deuterosomes (of course its more in depth). But my point is, this video is great! It has all the main ideas that are great to know!

  • @jessewru6425
    @jessewru6425 7 лет назад

    it never fails to ease my mind when humbled by such perspectives,
    i like the idea of being a tube, i can manage that.
    Get ready universe! im gonna be a greatly simple and perfectly efficient element in your life!

  • @Doomroar
    @Doomroar 11 лет назад +67

    Hey there Hank... do you, just maybe you know... as an hypothetical question, have any advice... on how to dispose a blenderized cat... without leaving any hint or proof of the cause of death?

    • @carloboy9170
      @carloboy9170 10 лет назад +9

      place in a container full of HCl :)

    • @Doomroar
      @Doomroar 10 лет назад +7

      Darryl Villar 2 months too late, but thanks!

    • @Cablev94
      @Cablev94 10 лет назад +27

      Eat it.

    • @kamealh
      @kamealh 10 лет назад +5

      lye
      bathtub
      an hour of time
      drain

    • @toshido_yamada
      @toshido_yamada 5 лет назад +2

      flush it down the toilet, but im 5yrs l8

  • @manu_bdl9333
    @manu_bdl9333 2 года назад +2

    I didn't expect the video to start this way

  • @moviemaker1986
    @moviemaker1986 11 лет назад +165

    A protostome?
    Well, I was wrong, and ended up feeling like an ass.

    • @Danyaalxmeah
      @Danyaalxmeah 9 лет назад +5

      Ahhhh you son of a bitch you 😂😂😂😂😂

  • @cynthiaa4382
    @cynthiaa4382 9 лет назад

    I could just watch John Green's videos and understand the major concepts. His videos is such a great resource. Thanks.

  • @TheAlGal8
    @TheAlGal8 9 лет назад +167

    so are sea sponges like the mongols? THEYRE THE EXCEPTION

    • @danielbody6051
      @danielbody6051 9 лет назад +4

      Lol, was thinking the same thing.

    • @adrianvenegas1700
      @adrianvenegas1700 8 лет назад +6

      +Daniel Body +change_your_fate
      I demand a SeaSponge-gol-tage. :P

    • @TheTexas1994
      @TheTexas1994 8 лет назад +6

      Cue the mongoltage

    • @robinchesterfield42
      @robinchesterfield42 7 лет назад +3

      MARAUDING SEA-SPONGE HORDES! This reminds me of that time I played SimEarth and (somehow) ended up with a starfish civilization? They made it to the Bronze Age--not bad for creatures that had to keep going back into the water. Maybe the Mongol-Sponges could be what invades their empire...

    • @therickestmaverick2713
      @therickestmaverick2713 6 лет назад +3

      I thought he was gonna say the mongols didn't have anuses of mouths.

  • @suelane3628
    @suelane3628 5 лет назад +1

    Again, a wonderful You Tube presentation by Hank.

  • @Doomroar
    @Doomroar 11 лет назад +48

    3:55 "Most animals have a mouth and an anus, wait for it, unless you are" a politician!!!

  • @xtechbiz
    @xtechbiz 12 лет назад

    Though the main focus is on the content, I can't help but think, "wow, they're really good with the animations and illustrations." It really makes things easier to understand.

  • @ChrisBrownLvr31
    @ChrisBrownLvr31 10 лет назад +3

    this is by far the best video of the handful I have watched, I couldn't stop laughing! P.S. crash course helped me get an A+ on my exam, thanks!:-)

  • @CF-sz9fm
    @CF-sz9fm 5 лет назад +1

    you have a knack for teaching my guy, love your vids. Best around, keep it up!

  • @angelicaporro4060
    @angelicaporro4060 8 лет назад +121

    We all start as buttholes, and some stay that way.
    -my mom

  • @Alexander-bd2hk
    @Alexander-bd2hk 5 лет назад +2

    best intro ever i cant stop crying :3 crystal hank for president lol

  • @VideoSouls
    @VideoSouls 11 лет назад +6

    2:12 that's exactly what I said when he said that

  • @coileymarche4449
    @coileymarche4449 11 лет назад +2

    Your videos on Biology have helped me finish up my studying for my exam tomorrow, thanks for all the edjyamacation

  • @animefn
    @animefn 9 лет назад +12

    That whole thing about Haeckel, I heard from my high school teacher. Only problem was it portrayed it as fact. I'm a senior in college and this is the first time sense that sophomore year in high school that I heard anyone mention it or even dispute it. Thus, until I saw this video, I thought it was fact.

    • @Nightraven26
      @Nightraven26 9 лет назад +2

      Yes, we also learned it as a fact in high school :/ (I'm from Europe)

    • @qualifiedcornstarch6859
      @qualifiedcornstarch6859 5 лет назад

      I had those drawings he made in all my textbooks as a kid

  • @LeahMarkum
    @LeahMarkum 9 лет назад

    It's nice to come across Crash Course videos that cover topics your high school (and university *shhh!*) biology classes preferred to skip.

  • @Yeetamusprime
    @Yeetamusprime 8 лет назад +89

    Like here for sea sponge rights

  • @konohaboyjr
    @konohaboyjr 7 лет назад

    Only video that actually shows you a good cut and view of the archenteron

  • @SurfingCA2
    @SurfingCA2 12 лет назад +3

    "Dude, no edge"
    "I know"
    XD It's been a while since I laughed that hard!

  • @Linkous12
    @Linkous12 12 лет назад +2

    If I were a high school biology teacher I would so use these videos. Entertaining and extremely educational.

  • @pranav_r
    @pranav_r 9 лет назад +3

    Man, I got so scared CrashCourse will never be the same. (I'm not that stupid, by the way)

  • @ItzThatOneAsian
    @ItzThatOneAsian 12 лет назад

    SOOOO awesome how you guys post this video right after the AP Bio exam when an essay question was exactly about this stuff

  • @yusrarahman2635
    @yusrarahman2635 8 лет назад +14

    Hipster Hank is his new nickname

  • @pacandpal3
    @pacandpal3 5 лет назад +2

    best intro to a biology course ever !! lol

  • @EmoNinjaGirl15
    @EmoNinjaGirl15 10 лет назад +5

    you and your tumblr hank XD i told my friend the thing about "we all were once just little butt holes" and my friend and i died laughing for a few minutes, then i ended up making his next phrase my tagline on deviantart "we're all just glorified assholes". fucking beautiful, lmao~

  • @username1568
    @username1568 7 лет назад +2

    Hank wearing a blond wig and trying to sound like a hipster fortune teller totally made my day

  • @TheVoMan
    @TheVoMan 11 лет назад +6

    Dammit, your vids are awesome.

  • @pinokosthewife
    @pinokosthewife 11 лет назад +2

    Thanks so much for this, I've forgotten a lot of this and it's a very helpful review both for my sister in high school (Biology, covering biodiversity!) and for me in college!

  • @karleybioanthro
    @karleybioanthro 9 лет назад +74

    I need a nerd boyfriend like Hank, ASAP!!

    • @nimruil
      @nimruil 9 лет назад +18

      Karley Spriggs Or we could clone him...

    • @karleybioanthro
      @karleybioanthro 9 лет назад +8

      That would be great! Then everyone can the nerdy cute boyfriend they want!!

    • @xx-nb6gr
      @xx-nb6gr 9 лет назад +1

      Karley Spriggs Ikr!!!

    • @arousedsquirrel2429
      @arousedsquirrel2429 9 лет назад +7

      +Karley Spriggs If only every girl thought like you.

    • @karleybioanthro
      @karleybioanthro 9 лет назад +4

      Lol, nerd power!

  • @arianarickenbacker8493
    @arianarickenbacker8493 10 лет назад

    Hank is the dreamboat of science

  • @janAlekantuwa
    @janAlekantuwa 8 лет назад +7

    "Dude, no edge!" Good times.

  • @theonewhoreadsalot
    @theonewhoreadsalot 12 лет назад +1

    You got the plural of Phylum right! My HONOURS biology teacher does not. Thank you hank!

  • @sharbels.3858
    @sharbels.3858 9 лет назад +43

    CAN YOU BE MY BIO TEACHER PLEASE

  • @Juniorall
    @Juniorall 10 лет назад

    Loved the way you started this one

  • @crisameim
    @crisameim 6 лет назад +7

    I’m developing a crush on Hank

  • @Misssarah3939
    @Misssarah3939 9 лет назад

    Thank you for the Table of Contents! It's super easy to find what I'm looking for!

  • @caseiscool90
    @caseiscool90 9 лет назад +8

    0:00 MY LIFE IS COMPLETE! XD

  • @hobbitandwife
    @hobbitandwife 12 лет назад

    I finally decided to start watching the biology courses, and clicked on this one to start... Hank you in a hippie getup has got me convinced. Okay, I'll watch these. :) [Seriously though, way better than I expected...]

  • @kristinanguyen4467
    @kristinanguyen4467 8 лет назад +18

    I'm always high in biology same

  • @richajournal
    @richajournal 11 лет назад

    Hank is the only reason I have hopes of passing my AP Bio exam on Monday. Thanks man :)

  • @dstinnettmusic
    @dstinnettmusic 10 лет назад +14

    wait for it, the sea sponges

    • @lalaithan
      @lalaithan 5 лет назад

      *cue the sea sponge-gol-tage*

  • @Havyn416
    @Havyn416 12 лет назад

    Favorite opening to a video ever

  • @annaarmstrong4723
    @annaarmstrong4723 10 лет назад +4

    Being British, I cringed at the 'kind of a spaz' comment - here it's a really offensive term. Still a really interesting video though! And 'dude... no edge' - I love Hank! :)

  • @chookievampyr
    @chookievampyr 10 лет назад

    My professor didn't deliver the lesson as hilariously as this. When it was mentioned that we started off as 'arse-holes' I couldn't contain myself, my inner 12 year old boy took over in a giggle-fit down front. This left me to explain to my professor, and 100 other students, that I know a few people that never really made it beyond that stage, clearly, they are still just one big butt hole. Hank, this was delivered the way all doctors and professors should teach it to their students, bravo! I nearly peed a little.

  • @bluoctopus3488
    @bluoctopus3488 8 лет назад +4

    How many times had you said the word "anus" in this video?

  • @fitzgerald415
    @fitzgerald415 12 лет назад

    hank's face at 3:51 is legendary. that coupled with the fact that he is about to say anus in a very strange way just made my day

  • @lucindashirreffs6703
    @lucindashirreffs6703 9 лет назад +5

    Sea sponges are the new Mongols

  • @madmanswords12
    @madmanswords12 12 лет назад

    Were I an educator, I would encourage my students to study from these. And it would only make me glad that he was covering the same material as me in a format that the students love and feel like is just screwing around on the computer.
    As a student who had an exam with questions that could range from anything in text books that tend to have 48 chapters, I couldn't study the whole thing over the past few days, but this would have been more helpful. If it were posted yesterday.

  • @norcofreerider604
    @norcofreerider604 9 лет назад +5

    Brb, buying a blender and catching a squirrel....

  • @EmoNinjaGirl15
    @EmoNinjaGirl15 8 лет назад

    still my favorite biology video ever

  • @powergannon
    @powergannon 12 лет назад +3

    "Ban us from schools?" They show these in schools!??? My high school was never that awesome.

  • @valerygonzalez7031
    @valerygonzalez7031 9 лет назад

    Hank Green makes me love bio even more.

  • @rishikperambur1228
    @rishikperambur1228 Год назад +7

    Me looking at these comments 8-11 years later

  • @functionifelse
    @functionifelse 12 лет назад

    It's amazing how the back of your book is the same is your green screen back drop, what a coincidence. Also, I totally dig CrashCourse:Bio way more than History. Thanks Hank.

  • @taylorswiftcovers
    @taylorswiftcovers 10 лет назад +6

    Deuterostome. I was once only an asshole.

  • @gezzapk
    @gezzapk 5 лет назад +2

    1:50 damn it was going to try that experiment on my little brother.

  • @tylerasnow
    @tylerasnow 8 лет назад +4

    But if they are such simple creatures, how can the sea sponge live in a pineapple under the sea?

  • @POTTERMiNES97
    @POTTERMiNES97 12 лет назад

    It seems you've alligned these videos in accordance to my Adv Bio class so that they are posted just after I am quized on it in school. Not cool, Hank. That's totally forgetting to be awesome.

  • @ChrisChebi
    @ChrisChebi 10 лет назад +12

    You-tube?

  • @kmt1341
    @kmt1341 12 лет назад

    I just took my bio 102 final....this video was a huge chunk of it! i plan on sending this video to my teacher to help her future students!

  • @oldomen3788
    @oldomen3788 8 лет назад +9

    heyyy.....dduuuudee....

  • @Missmadammozart
    @Missmadammozart 12 лет назад

    i love this i told my little brother "everyone starts out as an asshole a lucky few grow out of it"
    turns out i wasn't just calming him down, i was giving him a biology lesson ^^

  • @alecrisser12
    @alecrisser12 10 лет назад +5

    lol the hair

  • @Cubemaster
    @Cubemaster 4 года назад +2

    Sea sponges are the Mongols of Hank's videos

  • @nephdrummond3168
    @nephdrummond3168 9 лет назад +6

    Can someone please draw that? I want to see pictures of stomach-like tubes with anus's on one side and a mouth (with teeth) on the other, preferably crawling around.

  • @nabihasiddiqui9753
    @nabihasiddiqui9753 11 лет назад

    thankyou so much hank. you helped me pull through just enough to pass my bio exam after not paying attention all year

  • @aajjeee
    @aajjeee 11 лет назад +9

    dude... no edge

  • @Artifying
    @Artifying 12 лет назад

    I wish I could explain to people why your digestive system is so freakin' awesome like you do.

  • @Dranshusaini
    @Dranshusaini 4 года назад +4

    He is cute by the way

  • @HikeOutside
    @HikeOutside 7 лет назад +1

    HOW HAVE NOT MORE PEOPLE WATCHED THIS, YO THE AP EXAM IS IN A WEEK ISH

  • @randomtrucks
    @randomtrucks 9 лет назад +4

    By the way, Hank, "spaz" is an ableist slur, it might not be that good of an idea to use it in an educational series... Or, ever. Sorry if I'm not the first one who pointed that out and you already apologized for it.

  • @bethanyblueberry
    @bethanyblueberry 12 лет назад

    Love the 'no edge' at the beginning.