I can’t believe these videos are free to watch. I paid about $550 to struggle in my A&P class (textbook excluded), meanwhile I watch this 10 minute video and feel amazing afterwards- this was SO HELPFUL! THANK YOU!!!!
Notes for Integumentary System Part 2 When we notice what integumentary system is doing, results are often uncomfortable sweat glands -> smell, oil glands -> zits skin -> scaly or greasy 1st & most vital purpose of integumentary system = protective barrier skin, hair, nails, sweat, & oil glands all work together to shield from excessive sunlight, infections, abrasions, how you sense the world Cutaneous sensory receptors/corpuscles - structures part of nervous system in skin receive stimuli from outside environment & send stimuli to brain part of nervous system register diff sensations that associate w/ touch Types of Corpuscles tactile corpuscles - transmits sensations of light touch & low-frequency vibrations from periphery -> central nervous system lamellar corpuscles - register sense of pressure Hair follicles have receptors too -> why can feel slight breeze on skin or through hair More Functions of Integumentary system: removing waste, storing blood, and regulating body temperature Waste Removal Integumentary system excretes small amounts of waste eliminated through skin via sweat most nitrogen-containing wastes like urea, uric acid, and ammonia are disposed via urine isn’t much evidence that suggests heavy sweating rids body of any extra toxins, just losing more water Blood Storage Unit ~5% of entire blood volume retained in skin @ any given time when need more blood supplied to organs, (i.e.) when working out -> nervous system constricts dermal blood vessels to squeeze extra blood into circulation Body Temp Regulation During times of exertion, both blood & sweat glands work together to perform a key function: regulating body temp insensible perspiration = unnoticeable sweat even w/out exercise, body oozes out about 1/2 a liter of sweat per day to keep comfy temp No solute lost, just pure water sensible perspiration = noticeable sweat both solute & solvents lost could produce as much as 12 L of sweat per day To regulate heat loss dermal blood vessels constrict -> blood heads deeper into tissues & help keep vital organs warm Once things warm up, blood vessels in skin gradually relax & allow blood to return to surface Skin Discoloration: Cyanosis, Jaundice, and Erythema Changes in the color of skin can indicate homeostatic imbalances Cyanosis = Blue skin in Caucasian people may indicate heart failure, poor circulation, or severe respiratory issues cause blood that’s been depleted of oxygen turns darker in color, and when seen through lips/skin tissue, can look bluish Jaundice = yellowing of the skin usually signifies liver disorder Yellow bile starts accumulating in bloodstream Erythema = Reddened skin could indicate fever, inflammation, or allergy all of these conditions cause blood vessels to expand & more blood to flow to skin’s surface Human skin color wide spectrum, so some of these conditions easier to diagnose by looking for discolorations of other tissues (i.e. mucous membranes & beds of finger & toenails) Melanin, Vitamin D, and Skin Tone Melanin - pigment produced by melanocyte cells in epidermis 2 forms: produces pigments that range reddish yellow -> brownish black main job = protect from sun’s ultraviolet rays Historically, where solar radiation more intense -> higher concentrations of deep-colored melanin closer to poles, where solar rays weaker & more diffused, lower melanin concentrations allowed people to collect what sunlight was available, to manufacture vitamin D Vitamin D - required by bones to keep producing new bone cells & only vitamin body can produce on its own skin cells have a molecule that converts to vitamin D when it comes in contact w/ UV light Vitamin path: skin -> bloodstream -> liver & kidneys where vitamin D is activated (calcitriol) Then calcitriol circulated to all bones of body Skin appendages - hair, nails, sweat, & sebaceous/oil glands Hairs/pili - flexible strands of dead keratin protein cells, like fingernails Cuticle - outermost layer of dead keratin cells looks like overlapping roof shingles conditioner evens out rough surface between those cuticle cells to make hair look smooth 2 Main Regions of Hair shaft - where keratinization is completed root - part inside follicle where keratinization is still happening follicle - tube of epidermal cells just like in epidermis, cells @ bottom of each follicle are young & fresh, continually dividing & pushing older cells up through skin, into open air Finger & toenails pretty much grow same way start at @ back of nail bed where new cells divide @ root & get pushed forward creates scaly-hard keratin top layer 2 Types of Sweat Glands Up to 3 million tiny sudoriferous/sweat glands distributed throughout body & secrete salty, watery sweat 1. Eccrine glands - simple coiled tubes that start in dermis, extend through a duct, & open into a pore on skin’s surface more abundant than apocrine in palms, forehead, & soles 2. Apocrine glands only have about 2000 apocrine sweat glands Activated around puberty, empties into hair follicles around armpits & groin secrete sweat w/ fats & proteins in it More viscous & sometimes yellowish in color when bacteria on skin combine with this sweat, it gets odorific- body odor Deodorants don’t affect amount of sweat, but reduces smells by attacking stink-making bacteria, antiperspirants are opposite, uses ingredients (i.e. aluminum) to block sweat glands & stop perspiration Some researchers believe these glands are human equivalent of musky sex scent glands, might help w/ mate acquisition Types of Apocrine Glands Mammary glands - secrete milk in lactating people Ceruminous glands - make cerumen/earwax Sebaceous (Oil) Glands - found everywhere but thick skin in ducts are smaller on limbs, but they’re pretty big on face, and neck, and upper chest Most secrete sebum/oily substance into hair follicles where it can travel to skin’s surface- cause pimples primary goal: soften & lubricate skin & hair help slow water loss from skin in dry environments
coming on here to say even though these were put up 7 years ago, they are still so helpful!! I binged all of his videos for my A&P exam and made a 95! (almost a 100 if i hadn’t misspelled one word😀) BUT use these videos!! they teach you everything you need to know and more! So when your taking your exam you know more about each topic you studied!! (which helps if your teacher asks bonus questions)! So glad i started watching these :)
I love this show not only because of the value in self fascinated education but that I hardly ever see any negativity in the comments section We are all a great community with humor and a desire to learn and that makes me happy
Because he doesn't need to fill out 1 hour of time trying to seem smart. That prevents alot of useless conversations/over use of technical terms, straight to the point. The images help a ton also... He gets paid more when people watch more (assuming its his channel). Teachers get paid regardless. It might help also (seeings the thumbs up) knowing that people watching this video may be coming here on their free will to learn more. Whereas if you are comparing this to public school it is an obligation. So the intent/willingness to learn is very helpful...
Am I blind or are there really no comments?! I just came to say that I thoroughly enjoy what Crash Course and all the people helping out do to make this possible. Thank you. ♥
I have vitiligo (white patches on my skin) and it was kind of cool to learn about skin and stuff. My patches are mostly on my head, so I have so white stripes in my hair, which is kind of cool. I have 1 next to my eye and 1 on my left ring finger, too.
Love Crash Course...goes over the info way more in depth in 10 minutes than we do in my hour and a half class. One thing though - this video says your blood vessels constrict when you're working out in heat AND when you're cold. Your blood vessels dilate when you're exercising, bringing blood to the surface - that's why people get red when they're exercising. Might be a good idea to edit that part!
I like the speed of talking during this. Hank presents well. Plus, going over what was discussed at the end reinforces the concepts. These things are like speed learning video's compared to other vehicles of education. Damn those sebaceous glands..
I literally learn all the materials through video watching. This is so much better than my professor's teaching style. Thank you crashcourse for making anatomy interesting and understandable.
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
These videos helped me pass my A&P nursing course! I love these videos, they are very to the point on the main topics of each system. Great review tool for anyone! Love Hank Green!
You're awesome, continue doing such heroic acts for students by explaining these topics in a very well manner. You save us from the ambiguity that we get from the classroom. It even answers the questions that didn't exist in my mind. It really helps, most especially to me as a visual learner. Worth to subscribe
Hi Hank, I love your videos, they're so helpful and easy to listen to. I was wondering if you could please do a video on the cardiovascular system? Thanks so much!
I have nerve damage in the skin of my hip as a result of surgery. This video taught me the words for it. My tactile corpuscles in that area no longer seem to have any functionality (no surface-level sensation at all). My lamellar corpuscles still do function, though perhaps have been altered (I can feel pressure in a tender, somewhat painful way, even almost 7 years later). I wish I knew a way to heal this!!!
🎯 Key Takeaways for quick navigation: 00:00 🧴 Integumentary system care - Highlights the practical uses of grooming products for skin, hair, and nails beyond vanity. 00:52 🛡️ System protection - Outlines the integumentary system's role in protecting against environmental threats. 02:54 💧 Thermal regulation - Combines temperature regulation, body's perspiration process, and the skin's function as a blood reserve. 03:48 🌡️ Health indicators - Discusses how skin color variations can signal different health conditions. 05:39 🧖 Appendage maintenance - Merges the maintenance and importance of hair, nails, and skin's surface care. 07:01 💦 Gland functions - Simplifies the explanation of sweat and oil glands' roles in skin health and maintenance. 09:23 📚 System summary - Summarizes the integumentary system's protective, sensory, and regulatory functions. Made with HARPA AI
crash coarse youre doing fantastic, this is so correlated to my college level classes! I have the newest book and this video is on the exact same level. Thank you for your work, you really dumb things down and wrap them up beautifully. Will totally be subscribing and using your future videos to review! :)
Really blew my mind that the same kind of gland produces sweat, earwax and milk. Apocrine, you work too hard. Go on and take a vacation until we gotta feed a baby.
Mammary glands and apocrine glands are different. Apocrine is just a mode of secretion. And the apocrine glands present in our armpits and pubic region actually do not use the apocrine mode of secretion as previously thought. They use the merocrine mode of secretion.
I supported after these videos! You are helping me through my A and P courses so that I can go on to dental hygiene. It is not much but I am happy to help out:)
Question....? I wonder how many takes it took him to do this video and how much editing he had to do or is it just me? Very interesting! I love I'm a history and law enforcement major but I love working out and I'm curious of what my body is doing and Why.. I love these videos! Very interesting, I was thinking on signing up for Anatomy class next semester but I've rather watch these videos for now!
Johnathan K Woodard, that's incredibly immature to make fun of trans people, and a good probable indicator that you will never possess more than a single mate at a time, if even that many
EV Belluche Implying its a good thing to aquire more than one mate that you spend the rest of your life with? Being happy and healthy and sharing that special love with that special person? What a poor nihilistic way to look at life. No wonder there is such a hugh prevalence with mental disorders and mental problems, too many people dont beleive they are worth anything, and instead put value in petty sex and put value in how many partners you've had putting quantity vs quality.
You are the best! Love your expressions (obvious & subtle) almost like you are making fun of the very content you are teaching. Entertaining and attention keeping! You are GOOD. ;-) I learn easily from you and even enjoy it!! I think you are doing what God created you for!
5:00 Note that historical skin tone distribution doesn't simply follow the equator, with darker skin at lower latitudes. It also follows altitude (in mountainous areas, the sunlight is stronger) and coastlines (the surface of the sea reflects and amplifies UV light). :D Also, there are medical consequences to this. Everyone knows if you're light-skinned you need to watch out for sunburn, but if you're a dark-skinned person living far north or far south - make extra sure to get that sunlight in the winter!
AH! At 2:04 there is an Adipose in the Adipose! Thought Cafe are Whovians and this makes my love and respect for you grow! Love your lessons, they are such a wonderful tool!
Hey Crash Course, I'm really enjoying these videoes. I watched Biology and part of Chemistry, but this one is more interesting. Also, 10 minutes is the perfect amount of time. 15 minutes can become too much some times.
9 ปีที่แล้ว
I'm watching my Watch Later playlist in 1.5x because there are too many videos here now. I can't watch Hank in 1.5x because DAMN HE SPEAKS QUICKLY
CrashCourse That brings me to a interesting question. What is the factor that descides a Skeletons name? The person before its death had a name, but once its remains and skeleton is dug up and found and given a new name. What is then the true name? It's previous name or the current name?
Can you guys do a crash course on the muscles?? PLLLLEEEEASSSSEE!? We're working through the muscles in my anatomy class and I need some SERIOUS HELP!!
Dear Crash course great staff, thank you for the great job. I have a question regarding the vascularity of the epidermis, if it's avascular then how does the nutrients and oxygen get to it's layers (the four or five)? And can we get a cut wound in our skin without bleeding? And in cosmotic surgeries when they put flaps for burn areas, is there a epidermal-flap only? Sorry for all these questions, and the world thanks you for your Job :D
i dont sweat enough. it has to be 90F befor i start to noticeably sweat at all. at work when the ac broke i still had to worked full speed in 80F and ended up on the floor, unable to get up, still just a slight dampness under my armpits. for people who assume that i didn't have enough water, i had 7 liters of water that day.
I like watching your chanil It just make things easier and reallable 💜 I only hope you to expand your work and talking about medications and some medical cases in the same way that you show the difrents systems in our body
If you donate to Crash Course, do they let you influence what course they teach next? I'm hoping for either an Economics course or Story Writing course, especially since John Green is a best selling author.
I feel like I heard someone (John?) talk about a possible future economics course. I'm not sure at all, though. A story writing coure would be awesome, though.
I can’t believe these videos are free to watch. I paid about $550 to struggle in my A&P class (textbook excluded), meanwhile I watch this 10 minute video and feel amazing afterwards- this was SO HELPFUL! THANK YOU!!!!
Notes for Integumentary System Part 2
When we notice what integumentary system is doing, results are often uncomfortable
sweat glands -> smell, oil glands -> zits
skin -> scaly or greasy
1st & most vital purpose of integumentary system = protective barrier
skin, hair, nails, sweat, & oil glands all work together to shield from excessive sunlight, infections, abrasions,
how you sense the world
Cutaneous sensory receptors/corpuscles - structures part of nervous system in skin
receive stimuli from outside environment & send stimuli to brain
part of nervous system
register diff sensations that associate w/ touch
Types of Corpuscles
tactile corpuscles - transmits sensations of light touch & low-frequency vibrations from periphery -> central nervous system
lamellar corpuscles - register sense of pressure
Hair follicles have receptors too -> why can feel slight breeze on skin or through hair
More Functions of Integumentary system: removing waste, storing blood, and regulating body temperature
Waste Removal
Integumentary system excretes small amounts of waste eliminated through skin via sweat
most nitrogen-containing wastes like urea, uric acid, and ammonia are disposed via urine
isn’t much evidence that suggests heavy sweating rids body of any extra toxins, just losing more water
Blood Storage Unit
~5% of entire blood volume retained in skin @ any given time
when need more blood supplied to organs, (i.e.) when working out -> nervous system constricts dermal blood vessels to squeeze extra blood into circulation
Body Temp Regulation
During times of exertion, both blood & sweat glands work together to perform a key function: regulating body temp
insensible perspiration = unnoticeable sweat
even w/out exercise, body oozes out about 1/2 a liter of sweat per day to keep comfy temp
No solute lost, just pure water
sensible perspiration = noticeable sweat
both solute & solvents lost
could produce as much as 12 L of sweat per day
To regulate heat loss dermal blood vessels constrict -> blood heads deeper into tissues & help keep vital organs warm
Once things warm up, blood vessels in skin gradually relax & allow blood to return to surface
Skin Discoloration: Cyanosis, Jaundice, and Erythema
Changes in the color of skin can indicate homeostatic imbalances
Cyanosis = Blue skin
in Caucasian people may indicate heart failure, poor circulation, or severe respiratory issues
cause blood that’s been depleted of oxygen turns darker in color, and when seen through lips/skin tissue, can look bluish
Jaundice = yellowing of the skin
usually signifies liver disorder
Yellow bile starts accumulating in bloodstream
Erythema = Reddened skin
could indicate fever, inflammation, or allergy
all of these conditions cause blood vessels to expand & more blood to flow to skin’s surface
Human skin color wide spectrum, so some of these conditions easier to diagnose by looking for discolorations of other tissues (i.e. mucous membranes & beds of finger & toenails)
Melanin, Vitamin D, and Skin Tone
Melanin - pigment produced by melanocyte cells in epidermis
2 forms: produces pigments that range reddish yellow -> brownish black
main job = protect from sun’s ultraviolet rays
Historically, where solar radiation more intense -> higher concentrations of deep-colored melanin
closer to poles, where solar rays weaker & more diffused, lower melanin concentrations allowed people to collect what sunlight was available, to manufacture vitamin D
Vitamin D - required by bones to keep producing new bone cells & only vitamin body can produce on its own
skin cells have a molecule that converts to vitamin D when it comes in contact w/ UV light
Vitamin path: skin -> bloodstream -> liver & kidneys
where vitamin D is activated (calcitriol)
Then calcitriol circulated to all bones of body
Skin appendages - hair, nails, sweat, & sebaceous/oil glands
Hairs/pili - flexible strands of dead keratin protein cells, like fingernails
Cuticle - outermost layer of dead keratin cells
looks like overlapping roof shingles
conditioner evens out rough surface between those cuticle cells to make hair look smooth
2 Main Regions of Hair
shaft - where keratinization is completed
root - part inside follicle where keratinization is still happening
follicle - tube of epidermal cells
just like in epidermis, cells @ bottom of each follicle are young & fresh, continually dividing & pushing older cells up through skin, into open air
Finger & toenails pretty much grow same way
start at @ back of nail bed where new cells divide @ root & get pushed forward
creates scaly-hard keratin top layer
2 Types of Sweat Glands
Up to 3 million tiny sudoriferous/sweat glands distributed throughout body & secrete salty, watery sweat
1. Eccrine glands - simple coiled tubes that start in dermis, extend through a duct, & open into a pore on skin’s surface
more abundant than apocrine
in palms, forehead, & soles
2. Apocrine glands
only have about 2000 apocrine sweat glands
Activated around puberty, empties into hair follicles around armpits & groin
secrete sweat w/ fats & proteins in it
More viscous & sometimes yellowish in color
when bacteria on skin combine with this sweat, it gets odorific- body odor
Deodorants don’t affect amount of sweat, but reduces smells by attacking stink-making bacteria,
antiperspirants are opposite, uses ingredients (i.e. aluminum) to block sweat glands & stop perspiration
Some researchers believe these glands are human equivalent of musky sex scent glands, might help w/ mate acquisition
Types of Apocrine Glands
Mammary glands - secrete milk in lactating people
Ceruminous glands - make cerumen/earwax
Sebaceous (Oil) Glands - found everywhere but thick skin in
ducts are smaller on limbs, but they’re pretty big on face, and neck, and upper chest
Most secrete sebum/oily substance into hair follicles where it can travel to skin’s surface- cause pimples
primary goal: soften & lubricate skin & hair
help slow water loss from skin in dry environments
I got a test in an hour, this series is my savior, thank you!
Don Intrepid SAME
im late but did u pass?
@CeanZie same. I'll keep ya updated!!
Quis how you do
@@jacqui333. pretty damn good actually. Got a b.
coming on here to say even though these were put up 7 years ago, they are still so helpful!! I binged all of his videos for my A&P exam and made a 95! (almost a 100 if i hadn’t misspelled one word😀) BUT use these videos!! they teach you everything you need to know and more! So when your taking your exam you know more about each topic you studied!! (which helps if your teacher asks bonus questions)! So glad i started watching these :)
I love this show not only because of the value in self fascinated education but that I hardly ever see any negativity in the comments section
We are all a great community with humor and a desire to learn and that makes me happy
why is it that i understand more with you within 10 mins than i do with my professor in 50 mins.
Because he doesn't need to fill out 1 hour of time trying to seem smart. That prevents alot of useless conversations/over use of technical terms, straight to the point. The images help a ton also... He gets paid more when people watch more (assuming its his channel). Teachers get paid regardless. It might help also (seeings the thumbs up) knowing that people watching this video may be coming here on their free will to learn more. Whereas if you are comparing this to public school it is an obligation. So the intent/willingness to learn is very helpful...
Same
Am I blind or are there really no comments?! I just came to say that I thoroughly enjoy what Crash Course and all the people helping out do to make this possible. Thank you. ♥
Aw, thank YOU for your kind words and for being another awesome member of this community :)
-Nicole
CrashCourse thank you so much for the videos! properly learnt more in it than in school.
+CrashCourse u guys rule hank especially u u r one of the few cool nerds i have seen ;p
I have vitiligo (white patches on my skin) and it was kind of cool to learn about skin and stuff. My patches are mostly on my head, so I have so white stripes in my hair, which is kind of cool. I have 1 next to my eye and 1 on my left ring finger, too.
My anatomy teacher has been using these videos as a broad, yet condensed review of what we go over in lecture. Pretty cool teacher.
Love Crash Course...goes over the info way more in depth in 10 minutes than we do in my hour and a half class. One thing though - this video says your blood vessels constrict when you're working out in heat AND when you're cold. Your blood vessels dilate when you're exercising, bringing blood to the surface - that's why people get red when they're exercising. Might be a good idea to edit that part!
7:33 The sheer amount of joy at sweat that can appear yellowish in color.
I couldn't imagine reading a book and trying to just imagine all this. thanks!
crash course, please never stop posting. you guys are awesome.
I like the speed of talking during this. Hank presents well. Plus, going over what was discussed at the end reinforces the concepts. These things are like speed learning video's compared to other vehicles of education.
Damn those sebaceous glands..
I literally learn all the materials through video watching. This is so much better than my professor's teaching style. Thank you crashcourse for making anatomy interesting and understandable.
These videos are literally my life support through A&P right now.
This saved my life in physio and anatomy review for nursing school. THANK YOU !!!!!!!!!!!!!
I love this channel! Its easy to remember things with the way they are explained. It's too funny. :) Very entertaining.
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
These videos helped me pass my A&P nursing course! I love these videos, they are very to the point on the main topics of each system. Great review tool for anyone! Love Hank Green!
This show tickles and teaches me so much. The explanations are awesome. Grateful.
"Now if you pluck out a strand of your hair, you will be in pain."
-Hank Green
The Wisest words ever spoken
You're awesome, continue doing such heroic acts for students by explaining these topics in a very well manner. You save us from the ambiguity that we get from the classroom. It even answers the questions that didn't exist in my mind. It really helps, most especially to me as a visual learner. Worth to subscribe
These are great! Talk about a genius way to entertain while teaching! Brilliant, I can not emphasize that enough.
You make A & P fun, and remind me why I love science and want to try for Med School. Thank you.
I absolutely LOVE these videos and to be honest, my idea of a perfect man is Hank Green. He's hilarious! Carry on!
Thanks hank for helping me last minute study an entire semesters worth of research
Thank you! These vids definitely have helped with my A&P class!!
This really is helpful when you are just trying to get the big picture for the whole chapter! Thanks
Thanks for creating these! They help so much when reviewing for an A&P test!!
Literally was reading this chapter in my lab book and now I understand it 100 percent
Hi Hank,
I love your videos, they're so helpful and easy to listen to. I was wondering if you could please do a video on the cardiovascular system?
Thanks so much!
I have nerve damage in the skin of my hip as a result of surgery. This video taught me the words for it. My tactile corpuscles in that area no longer seem to have any functionality (no surface-level sensation at all). My lamellar corpuscles still do function, though perhaps have been altered (I can feel pressure in a tender, somewhat painful way, even almost 7 years later). I wish I knew a way to heal this!!!
These videos are really helping me with my Anatomy class... thank you!
🎯 Key Takeaways for quick navigation:
00:00 🧴 Integumentary system care
- Highlights the practical uses of grooming products for skin, hair, and nails beyond vanity.
00:52 🛡️ System protection
- Outlines the integumentary system's role in protecting against environmental threats.
02:54 💧 Thermal regulation
- Combines temperature regulation, body's perspiration process, and the skin's function as a blood reserve.
03:48 🌡️ Health indicators
- Discusses how skin color variations can signal different health conditions.
05:39 🧖 Appendage maintenance
- Merges the maintenance and importance of hair, nails, and skin's surface care.
07:01 💦 Gland functions
- Simplifies the explanation of sweat and oil glands' roles in skin health and maintenance.
09:23 📚 System summary
- Summarizes the integumentary system's protective, sensory, and regulatory functions.
Made with HARPA AI
So useful and entertaining... thank you once more!!!! :)
Thank you crashcourse! Always helping me cram for my exams :)
Really loving this CrashCourse series and wondering why I didn't take biology in high school - this is fascinating stuff!!
Thank God these videos exist
crash coarse youre doing fantastic, this is so correlated to my college level classes! I have the newest book and this video is on the exact same level. Thank you for your work, you really dumb things down and wrap them up beautifully. Will totally be subscribing and using your future videos to review! :)
Finally a Doctor Who Adipose at 2:10 :)
+Ginger Braid Girl omg you're right how did you notice!?
I know I'm late, but from your thumbnail it looks like you waited a while...
Thank you so much for these videos! I'm in medical assistant school, your videos really help me study 💗😊
Really blew my mind that the same kind of gland produces sweat, earwax and milk. Apocrine, you work too hard. Go on and take a vacation until we gotta feed a baby.
Mammary glands and apocrine glands are different. Apocrine is just a mode of secretion. And the apocrine glands present in our armpits and pubic region actually do not use the apocrine mode of secretion as previously thought. They use the merocrine mode of secretion.
Oh I see, it's just the same mode of transport with different actual rooted glands. That makes a lot more sense then.
***** Congratulations on turning 10 years old this year. That's gotta be really special for you.
***** Yep. High five. You really got me, oh boy i tell ya.
Bye now.
Omg😑
Not even CrashCourse can resist putting boobs in the thumbnail.
Hehe, of course! lol
And 69 likes on this comment
why are we liking this?
@@innerash_ because boobs
@@nrggvrn5576 it’s not appropriate.
we're so blessed to have crash course
Thank you John Green, after watching you for world history, I come back for biomedical science
at 19 seconds hilarious! Love you guys I have an exam today and have been binge watching
I So Love Watching These Videos!!
Hope there will be a part 3. This is really really interesting
I supported after these videos! You are helping me through my A and P courses so that I can go on to dental hygiene. It is not much but I am happy to help out:)
0:12 Nice to see that Hank uses Hemp lotion.
Really? I didn't even notice! Cool
Hank, when you are done, we need a Crash-course Mathematics, and physics
Question....? I wonder how many takes it took him to do this video and how much editing he had to do or is it just me?
Very interesting! I love I'm a history and law enforcement major but I love working out and I'm curious of what my body is doing and Why.. I love these videos! Very interesting, I was thinking on signing up for Anatomy class next semester but I've rather watch these videos for now!
Ah...the true reason for skin color explained very neatly. 💓 love it. That’s it.
thank you very much with this crash course, it helps me to recall all things I've learned in college. . . . . . . .
this really helped me get a better understand. I will definitely be sharing this with my class mates.
Thanks so much for these videos! Thanks to them, studying for AP is much easier and more interesting!
Love your videos- especially with the animations
Thank you Crash Course! I retain more from you than months in college lecture.
I find it comforting that the woman around 8:00 finds a male and a female mate.
Ikr?
Uh.. did you just assume all three of their genders? What is this, 1845? Just gross.
Johnathan K Woodard, that's incredibly immature to make fun of trans people, and a good probable indicator that you will never possess more than a single mate at a time, if even that many
EV Belluche Implying its a good thing to aquire more than one mate that you spend the rest of your life with? Being happy and healthy and sharing that special love with that special person?
What a poor nihilistic way to look at life. No wonder there is such a hugh prevalence with mental disorders and mental problems, too many people dont beleive they are worth anything, and instead put value in petty sex and put value in how many partners you've had putting quantity vs quality.
wut?
Thanks Hank, you're a god amongst men
I spotted a Body Shop hand cream in the pile of lotions! I love the stuff :D
Thanks to this I might actually survive my test tomorrow
your videos are the best! it catches me attention while learning, thank you sooo much!
You are the best! Love your expressions (obvious & subtle) almost like you are making fun of the very content you are teaching. Entertaining and attention keeping! You are GOOD. ;-) I learn easily from you and even enjoy it!! I think you are doing what God created you for!
8:08 yea yea punx, get some of each!
Does that mean healthy hair is healthy dead cells? (´･_･`)
YUP
haha weird
What fine looking cellular cadavers you have adorning your cranium. So moisturized, shiny, and well preserved.
technically, yes.
@starryeyes That was my reaction when I heard about it for the first time ....😬pretty weird
Im glad I understand this cause its so GODDAMN INTERESTING I REALLY LOVE THIS VIDEOS
I just watched a Hank Green STEM ad before a Hank Green video.
5:00 Note that historical skin tone distribution doesn't simply follow the equator, with darker skin at lower latitudes. It also follows altitude (in mountainous areas, the sunlight is stronger) and coastlines (the surface of the sea reflects and amplifies UV light). :D
Also, there are medical consequences to this. Everyone knows if you're light-skinned you need to watch out for sunburn, but if you're a dark-skinned person living far north or far south - make extra sure to get that sunlight in the winter!
Much love for your videos! They have helped me so much in getting through all of my science courses! :)) THANK YOU
You are the best you teach better than my teacher and less serious and fun you the best
I love this show thank you it’s entertaining and easy to understand
AH! At 2:04 there is an Adipose in the Adipose! Thought Cafe are Whovians and this makes my love and respect for you grow! Love your lessons, they are such a wonderful tool!
Very very helpful, specially fle my midterm today
love this. using this as reference for my report in school.
Hey Crash Course, I'm really enjoying these videoes. I watched Biology and part of Chemistry, but this one is more interesting. Also, 10 minutes is the perfect amount of time. 15 minutes can become too much some times.
I'm watching my Watch Later playlist in 1.5x because there are too many videos here now.
I can't watch Hank in 1.5x because DAMN HE SPEAKS QUICKLY
THE COURSE IS an amazing. I love it so much and I
Does the skeleton have a name? The skeleton needs a name.
His name is James Bonwinton.
He does, indeed! His name is Stan ;)
-Nicole
CrashCourse
That brings me to a interesting question.
What is the factor that descides a Skeletons name?
The person before its death had a name, but once its remains and skeleton is dug up and found and given a new name.
What is then the true name? It's previous name or the current name?
CrashCourse
Wait, Stan Muller had his skin pulled off!?! Oh no!
Oh well... ITS FOR SCIENCE!
howbout Cedric as a name for the Skeleton :)
one of best intros
Kathleen Yale is my hero.
Love this! Can you guys do one about blood? white and red blood cells and all that and the process!! you guys are the best!!!
Can you guys do a crash course on the muscles?? PLLLLEEEEASSSSEE!? We're working through the muscles in my anatomy class and I need some SERIOUS HELP!!
This helps in class so much thanks for making this.
"It takes a lot of science to tame this mane," LMFAO YOU STRANGELY COOL PERSON
Dear Crash course great staff, thank you for the great job.
I have a question regarding the vascularity of the epidermis, if it's avascular then how does the nutrients and oxygen get to it's layers (the four or five)?
And can we get a cut wound in our skin without bleeding?
And in cosmotic surgeries when they put flaps for burn areas, is there a epidermal-flap only?
Sorry for all these questions, and the world thanks you for your Job :D
YAY A GREEN BROTHER! I watched this one.
i dont sweat enough. it has to be 90F befor i start to noticeably sweat at all. at work when the ac broke i still had to worked full speed in 80F and ended up on the floor, unable to get up, still just a slight dampness under my armpits. for people who assume that i didn't have enough water, i had 7 liters of water that day.
I caught that little adipose (Doctor Who reference) at the adipose layer in the hypodermis! Very funny!
I like watching your chanil
It just make things easier and reallable 💜
I only hope you to expand your work and talking about medications and some medical cases in the same way that you show the difrents systems in our body
Hurray for science!
I need him as my Prof, I won't ever get bored 😂
A+ thumbnail choice. 👌🏻
If you donate to Crash Course, do they let you influence what course they teach next? I'm hoping for either an Economics course or Story Writing course, especially since John Green is a best selling author.
I feel like I heard someone (John?) talk about a possible future economics course. I'm not sure at all, though. A story writing coure would be awesome, though.
i learned more from this than listening in class.
Thanks so much I am struggling with my his class so this does help a lot
I don't know but that's a good question
Silver(AG) ingestion can turn people blue too. just saying. the faces on the cells are amazing. :P