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

Hank discusses the process by which organisms grow and develop, maintaining that, in the end, we're all just tubes.

Table of Contents
1) Zygote 2:38
2) Morula 2:53
3) Blastula 3:25
4) Radial Symmetry 4:11
5) Bilateral Symmetry 4:26
6) Gastrulation 4:52
7) Blastopore 5:02
8) Gastrula 5:17
9) Protostomes & Deuterostomes 5:33
10) Germ Layers 6:22
a) Diploblastic 6:32
b) Triploblastic 6:44
11) Biolography 7:27

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[KokoKoko-ogjs]

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

[FraserSouris]

We started from the bottom, now we are here.

[randomtrucks]

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

[faryaarshad]

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

[thebrookster]

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

[lifetheuniverse]

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

[aaaaammmmmyyyyyy]

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

[manu_bdl]

I didn't expect the video to start this way

[Shelinatorable]

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. <3

[rachelk.]

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!"

[tifelicity]

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

[simoneyuille]

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.

[JonahPleatherbooth]

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.

[harjashow]

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

[terminallyonlinezillennial]

"...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).

[potenvandebizon]

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

[fattonysullivan]

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

[rachesc]

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

[rebecagontijo]

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

[TheAlGal]

so are sea sponges like the mongols? THEYRE THE EXCEPTION