Great Glands - Your Endocrine System: CrashCourse Biology #33

Hank fills us in on the endocrine system - the system of glands that produce and secrete different types of hormones directly into the bloodstream to regulate the body's growth, metabolism, and sexual development & function.
References:
www.vivo.colostate.edu/hbooks/...
www.vivo.colostate.edu/hbooks/...
www.khanacademy.org/science/he...
www.ncbi.nlm.nih.gov/pubmed/21...
www.ncbi.nlm.nih.gov/pubmed/98...
www.biologicalpsychiatryjourna...
Table of Contents
1) Signalling Systems 2:07:0
2) Pituitary 3:19:1
3) Hypothalamus 4:17:1
4) Thyroid 4:52:1
5) Adrenal 5:38:1
6) Pancreas 6:51:1
7) Biolography 8:49:2
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[@thenightreaper8533]

Table of Contents 1) Signalling Systems 2:07 2) Pituitary 3:19 3) Hypothalamus 4:17 4) Thyroid 4:52 5) Adrenal 5:38 6) Pancreas 6:51 7) Biolography 8:49

[@awsmrandomness]

"Sex glands come in two different flavors..." - Hank Green, accidentally making oral sex jokes since 2012.

[@Luminary2024]

ahaha

[@rynsawyer4185]

+Sepiida Nice... now I'm feeling awkwarder than I am usually.

[@eli19151]

Yeah... seriously, that was the cutest thing ever :D

[@skyofstorms]

Nice to see another brony/pegasister in the comments of an unrelated video. #BroniesFTW

[@xsjgalsabg]

my teachers literally put these videos on in class and leave. They're getting paid for this.

[@TheWolfgangGrimmer]

+xsjgalsabg You'd think they'd tell you to watch this at home and actually do their class when school is on.

[@joeyb649]

+Grant K Yes teachers get paid minimum wage..... specially at state schools... no benefits... FOR LIFE either...

[@clionaj3517]

in America?

[@PrycelessIrving]

yeah, teachers actually get paid terribly for long hours and a heavy workload.

[@yaqarianfanashira]

xsjgalsabg Mine too ahahahha but Hank teaches better than them half the time so I don't really mind

[@nickkidson337]

Hank teaches me more in these 30 min lessons than my biology teacher does in 4 years

[@funnystuff1284]

Why can't hank and Vsauce be my teachers? Life would be perfect.

[@funnystuff1284]

You know damn well what I meant smart ass

[@coreynorman3083]

Josh Behrens fuckin served

[@purum6060]

Josh Behrens LMAO

[@GoatPunishment343]

But they're really unintelligent humans, why would you wish that scenario would come to occur you noob!!!!

[@GoatPunishment343]

MrJacktheGC123 says the guy that plagiarises people and can't read

[@mulwelimushiana8388]

LOL, This is my first time commenting on a youtube video, I just couldnt let it go. I watched this video out of interest, I have got to say this guy is the funniest lecturer I have never ever ever ever ever met. you too good man, I got myself watching this whole video even though I am writting an entirely whole lot different module exam tomorrow. BIG UP

[@zeeh8661]

test in 13 hours and this is my first day studying FML!

[@zeeh8661]

+Jesse Piazza barely got C+ for the class..lol I know if I didn't study last min I could have gotten an A- or B+

[@johnpalcon7570]

exam on 6 hrs and first time studying and manages to get A- in Gr12 Bio U

[@FenixNations]

sounds like a win to me

[@lolars__]

Test in 10 hours 1 time studying in 2 weeks :) oh boy

[@dannycamello6106]

Final tomorrow, barely studied

[@tylerlenzi]

Thanks to you I got a 97% on my science exam

[@8josyjos844]

For all the people asking for slower talking, turn on the captions/subtitles!(the cc button) it's very helpful! I like it a lot! =)

[@Danxoxox]

I want to make a really important distinction that wasn't made in the video. An Exocrine gland is not synonymous for "secretions outside of the body." An Exocrine gland is a gland that secretes through a duct, which yes, primarily includes secretion to the outside of the body like sweat and salivary glands, but it also includes glands that secrete inside of the gut, such as the pancreas secreting enzymes into the lumen of the small intestine. Don't let that trick question on the exam throw you off! ;)

[@zeannajanmohamed4479]

technically speaking though, your small intestine is actually the "outside" of your body, since your alimentary canal is actually just this giant and long weird hole inside your body connected to the outside world via your mouth and anus. An exocrine gland does put secretions outside the body because like you said it uses ducts to secrete things onto an epithelial surface, just make sure youre careful when explaining what is inside vs outside when you consider your body :)

[@btshavemercyonmyheart7892]

isnt endocrine gland the secretion of hormones in blood ?

[@jadattia6723]

well said , and more specifically : an endocrine gland throws its hormone directly into the blood stream .

[@greennitricoxide2706]

you saved my test score. Thanks.

[@davidscavone3475]

ACTH - would not actually cause the release of epinephrine; it would cause the release of adrenal cortex hormones, e.g. Cortisol and Aldestoreone. Epinephrine and norepinephrine are released from the adrenal medulla when it is innervated by the sympathetic nervous system (neural stimuli) when the body is experiencing short term stress (exercise - anxiety - shock). Which brings to the next point - Glucagon is mainly released to maintain homeostatic range of blood-glucose levels when an individual is fasting. When an individual is doing "push-ups" this triggers the short term stress response - by the sympathetic nervous - and thus the key hormones in this situation would actually be epinephrine and norepinephrine - which stimulate glycogenolysis and gluconeogenisis (amongst other things) thus increasing blood - glucose levels for muscle cells

[@benlelek1411]

you remind me of squidwird from spongebob cuz you are smelly

[@stijn4687]

go out and play with the other children in the garden......

[@tiffanycrosby8402]

thank you, because I have that in my lecture notes and thought I had lost it!

[@katbee47]

I'm a nursing student, and your videos are a BIG help in reinforcing what we are learning! Love them!

[@melissahalby7072]

I loved when Hank gets hit by the duck! so funny haha

[@sonlam1047]

ALL TO HELP YOU ON YOUR QUEST TO VANQUISH THIS DASTARDLY DRAKE

[@skatesnlaces09]

I LOVE THIS!!! Seriously I was assuming this would be part of the crash course A&P that is currently going, but getting to see Hank circa 2012 is just AWESOME.

[@mykadassano438]

"We're doing science, pay attention!!!"

[@myprrrecious]

Myka Dassano :)

[@alarqrez3479]

Am I the only one who was not paying attention until then, lol

[@camerontaylor7471]

And that is the mind control in full effect...

[@StrongMed]

The "glands" that become swollen when sick aren't true glands in the medical sense (i.e. they aren't part of the endocrine system, nor do they secrete hormones). Swollen "glands" are actually lymph nodes, which are part of the immune system, and are responsible for producing antibodies and generally helping to coordinate the body's response to infection.

[@StrongMed]

Adrenaline (a.k.a. epinepherine, although many people use the term adrenaline to colloquially refer to norepinepherine as well) is not instantaneous. The instantaneous response that is felt is due to the actions of the nervous system: the central nervous system (i.e. brain), and the sympathetic and parasympathetic aspects of the peripheral nervous system are all involved. Neurotransmitters are responsible for the immediate effect, while adrenaline may take anywhere from 15-60 seconds.

[@rashmika9742]

Remember when Taylor Lautner was relevant?

[@MeegsyB]

It amazes me how Hank and John can take two of the most lecture based, boring subjects (at least by popular opinion, any way) and make it funny/interesting. I tip my hat to you two, great job!

[@emmaporter2064]

i wouldn't pass anything in biology without these videos, i am actually so thankful for you Hank :D

[@MsKerrik68]

Thank you Hank, you have just managed to help me not be so terrified and overwhelmed by my physiology and anatomy exam tomorrow. Thanks for ever! :) Excellent and informative clip

[@MCVarib]

I SWEAR HANK -YOU ARE THE COOLEST GUY!!! I wish you were my science teacher in everything...YOU KNOW EVERYTHING!

[@heyysimone]

"For those of us who dont have all friggen day" haha. Im doing a summer paper about human bioscience and these videos have pretty much helped me understand my textbook :)

[@mylajanedamasco1089]

This is the most comprehensive and clearest explanation of the body systems.

[@cosmicdemon5279]

anybody still using this in 2023? lol

[@roseinutube]

I hope you know that you are currently helping me SO much! These crashcourse biology videos are helping me get into a medical university I have been dreaming of going to! Things are explained so much better than any textbook i have found till now! thank you!!!!

[@giboranak]

this is a nice change to most channels that just spew their information with no flavor what so ever. this is useful as a recap before delving deep into the belly of the beast and digesting the info. thanks a bunch

[@crashcourse]

make sure you haven't "hidden" the annotations - it's the button on the video that looks like a text box (bottom right). they should be there for everyone.

[@janineapb]

Hank, you're the funniest, most entertaining and information loaded teacher ever 😂😍😍😍

[@kelanianderson-jemal5283]

I truly enjoy these crash course videos!!! Hats off to the entire production team for blessing us with these amazingly educational tutorials on science topics. Kudos!!

[@mismonty46]

Thank you SOOOO much for making Crash Course. I just started my sophomore year of high school, and I'm taking four science classes. Already I can tell that I'm going to need these videos to drag me through Human Anatomy & Physiology. You rock, Hank!!

[@juliasullivan2765]

Had to watch this for school. Actually liked it lol. Usually she picks bad videos for us to watch but I like crash course best. This is my favorite video

[@AppendixVermiformis]

When an angry duck hits you in the face, your adrenal MEDULLA is the one secreting epinephrine, stimulated by the sympathetic nervous system. The release of ACTH would be stimulated if the angry duck was so angry it hit you in the face all day, causing you distress, and stimulating cortisol release by the adrenal CORTEX (that's why it's adrenoCORTICOtropic hormone).

[@helenjones9322]

Love this guy, so useful, thanks :)

[@josepasco7457]

Haha!....Happy New Years!!...very informative lol I now know what the nads are for ty ty.....

[@benlelek1411]

i like his glasses

[@chelsealord9178]

My instructor is on the ancient side and did a good, but very long drawn out explanation (while putting me to sleep) of the endocrine system. This is an AWESOME recap before an exam with some cool added info. Shared this with some friends in my class and they all agreed these vids helped them out a lot! Thank you HANK!

[@KarlieCol]

I was just recently diagnosed with Hypothyroidism and this has been the first time that I have actually fully understood what is going on in my body. Thank you so much, Hank!

[@mjg4807]

i literally learned more in that 11 minute video than two hours in lecture....i need to re think my strategy. Great videos guys!

[@CallMeCJ_]

You are incredible Hank. My sister has missed nearly the entire first half of the school year due to illnesses and injuries. She was able to self-teach her the material on our Science midterm, using you and our textbook. You deserve all my internets, and all of my future offspring's internets.

[@Zagareus]

Hank is the real MVP in my education.

[@OliveroG]

I can't thank you guys enough, your Crash Course in Psychology aswell with the Nervous System and Endocrine System has helped me so much, i wish more of my friends spoke english so they could watch this awesome series!

[@JustineCepriano]

I love you!! Thank you so much for this. Helped me a lot with for my Physiology class.

[@youngnattymusic]

It's amazing how u can teach so many units in one course. And Hilarious ! XD .... teachers should just put up Crash course to teach students everyday so we don't waste time with misunderstanding and unnecessary teachings

[@rumderful]

And Hilarious ! XD

[@joshuahadams]

My bio teacher has us watch these videos for review or introduction to units.

[@AmeliaDesign]

I don't even remember how I found you guys, but this has helped me get through my COLLEGE biology class. It is online based, and I'm an audio-visual learner, which makes it hard for me to understand complex topics by reading through forums. Love the humor and crazy (but so very real--I get hit by ducks almost daily), illustrations. Please keep it up!

[@shreyalitoria7648]

its very nice to get to know about these glands in brief.

[@UrefutGeonsur]

Hank for president!

[@alexvaldez9941]

SHOOT!!! i need to learn so much before tomorrow! I have my end of course major test tomorrow .... ima cry

[@HemmieHaru]

How did it go?

[@HowREaliZShE1]

This was just what i needed . Quick, Simple and Easy to understand !

[@karalovell2]

You are by far my favorite go to for backing up and putting into perspective what I'm learning! Keep it up! You're awesome, interesting, and funny!

[@Thomas_Winters]

thank you for the duck part. i am pleased.

[@redarcs5273]

Two different flavors...

[@davetriplett8109]

Redarcs Just go with it))))

[@wendylackey4531]

My PN course utilizes your courses. I binge watch to absorb as much information as possible before each test. So far I am doing ok. Thank you!

[@Ambrocious93]

I started my medical degree on Monday, this channel is a freaking life saver.

[@cutiepiedaina]

omg i died at the two diff flavors

[@umadwivedi5508]

Oh my god. ADIPOSE. IT ALL MAKES SENSE NOW.

[@lorddio2572]

whovian

[@bdwimmer1564]

adore the sarcasm, I wish professors had this ability

[@payasitarosita]

Talking fast makes it more interesting. Love it!

[@GroundZero000]

Loved the angry duck part!!

[@yenikavega939]

He’s way better than my teacher

[@cweb1988]

this is the greatest thing ever. I love learning about the body. And this does it so fast, so succinctly, and so clearly.

[@meredithbarrett8395]

I loved this! You make the very complex endocrine system, short, sweet, simple and fun!

[@parthshahani3071]

Hey where can I get the summary of what u explain in free PDF form? P.S.-Too good videos...!!!

[@dashkajulien6061]

You can get this in PDF form, how?

[@oliedason8682]

This helped Soooooooo much :D

[@nspjr14]

BEST CRASH COURSE BIOLOGY YET!

[@flesheater2012]

Yet another project saved thanks to the awe inspiring knowledge of these two brothers. Thank you, thank you very much indeed.

[@hannahkahrs9132]

Im watching this because I dont want to read the lesson. It's really long.

[@tanushreesudheer3750]

Same...

[@Leo-ew3lx]

Right there with ya

[@anupamatiwari293]

same

[@ExploreCHINA616]

this merely scratched the surface of the endocrine system

[@SJKlapecki]

Well, they can't explain the entire thing.

[@SUNNYBOIBIZ]

crash course

[@doc.l]

My teacher uses this as an overview before we go into the topic.

[@theblindlucario5093]

My ap bio teacher doesn't even explain it.

[@modelaircraft12]

Linges Hels this is why we have doctors who spent most of their lives learning about the endocrine system and its respective pathologies, this is just an introduction, and a pretty good one :D

[@SocheathSim]

I love all your videos, they have been helping me out tremendously. I really appreciate all the work you all put in to make all these awesome videos!

[@TheBoombox200]

I have a test on the endocrine system tomorrow! Perfect timing!

[@anthony-riley]

9:47 "EMBYOS'

[@MeiDaGay]

lmao!! XD

[@Mereshort]

This is my favorite. 2019. So funny.

[@hilovestheworld]

THIS VIDEO WAS SO HELPFUL!

[@arjunpachory]

Best. Crash Course (Biology). So Far. Risky to say ever here, when one can be so easily proven wrong within a week!

[@adamchen5936]

sex glands come in two different flavors.

[@haree542]

Great work man keep it up, i learnt heeps

[@dawn7177]

I have an exam in two hours and oh boy this helped me a lot.

[@kirstiesquillace4560]

i struggled for three nights trying to cram in as much studying of the endocrine and got no where!!! after 11 minutes i am completely satisfied and feel so confident :) THANK YOU!

[@midnightpaleo]

Stupid hormones! I'm studying for a test, stop thinking this guys is adorable!!!

[@icebergi]

Arielle .Young Ugh I guess it's my turn to study for a test where this is in. xD Eh, the bad luck we all have. ._.

[@midnightpaleo]

XD

[@mikhailablack2656]

He is adorable!

[@csagan-bh2qy]

Ari Young ,its fun

[@poppyrose1549]

*guy's

[@sahilmalhotra2750]

im dying! "sex glands come in two different flavors" xD 8:11

[@pandapoogey]

I honestly don't think I could have passed my first year or a levels without your topics last year, and now you're coming this topic too!!! On time :-D thanks hank

[@MegaVernon42]

Great job!! You kept it fresh and most interesting!!

[@brandy1185]

I wish he was talking a little about the lymph

[@darrelstinkmeaner4673]

I KNOW I CAME HERE FOR LYMPH

[@madisonrudkin5430]

darrel stinkmeaner Me too!

[@nehajain516]

anyone in 2019?

[@xps7370]

I will be in 2020

[@mariagonzalez8407]

Neha Jain 2020 🙋🏻‍♀️LOL

[@destinycoleman1167]

Neha Jain yes

[@galahadthegreen5696]

I’m in 2020

[@georgiannacollier1041]

That was awesome. Straight to the point. loved it.

[@sunnisukumar]

Wow, that was an incredible overview in just 11 minutes. Great review, plus a few things I didn't know.

[@ArtsyChick24]

I thought you were gonna talk specifically about the hormones like FSH and LH and Estrogen and their role in like menstruation.... pls someone help I have an exam tomorrow...

[@beth9603]

SAME I've biology exam tomorrow. :( how did yours go?

[@ArtsyChick24]

***** it went okay...I'm praying for like a 5 (IB grade which is equivalent to like a B-)

[@beth9603]

You'll get it! :)

[@angienaranja]

All these people asking him to speak slower.. Maybe you're just too damn slow. Quit complaining.

[@avonbrownie]

like have you heard of PAUSE?! lol

[@torgeirknutsen2779]

Put the speed down to 0.75

[@stephieidk]

My entire lab lecture explained in 11mins instead of 3 hours trying to stay awake in class and not understanding a thing. Thanks Hank!

[@Miike183]

Hank I swear it's like you're following my Biology syllabus, I love these videos!!!

[@Vancouversour]

All over the FRICKIN place hahaha

[@yiranyang3072]

Does Hank never blink?

[@lameking2839]

Naaa

[@justinabenson7229]

He does

[@Dolsey3]

I'm prepping for the MCAT and these videos are an awesome review of the major systems! Thanks so much!!!

[@LauraB5345]

I learnt more from this video than I have In 2 weeks of A level biology !!

[@marxhamakhan1]

Sal and Hank are Gods among men..

[@gianandreifabia9052]

You forgot John. Boohoo.

[@leo-hao]

Wait there’s a third brother?.? I’m missing out!?!?

[@jdcelery]

you are cute and smart :)

[@ArtisanJanelle]

AWESOME Crash Course! I've seen almost all of them and I think this was my favourite so far. :)

[@DerekABozzi]

I cant express my appreciation for what you have done here and all other videos. thank you. YOU ROCK!!!!!!!

[@HolyToledo-]

"A little snuggle of baby"

[@not_relevant]

can you be our teacher please........................................

[@vincentmedina9960]

I know right? Even though my AP Bio teacher is just as good as Green!

[@UndergroundPebbles]

These videos allow me to constantly amaze my teachers with my knowledge.

[@rockusrock]

Thank you for these videos! They have helped me a lot!