Do You Really Have a New Body Every 7 Years?
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- Опубліковано 29 тра 2016
- You may have heard the rumor. Every seven years your body becomes a whole new person. But is there anything to this? Check out this SciShow episode to find out!
Hosted by: Hank Green
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Sources:
www.livescience.com/33179-does...
book.bionumbers.org/how-quickl...
askanaturalist.com/do-we-repla...
science.howstuffworks.com/life...
www.newscientist.com/article/...
www.wisegeek.org/what-is-the-a...
www.ncbi.nlm.nih.gov/pmc/artic...
www.tandfonline.com/doi/abs/10...
gizmodo.com/how-nuclear-bombs-...
www.ncbi.nlm.nih.gov/books/NBK...
The only thing that mildly irritated me was the fact that a chicken drumstick fell into the stomach acid as he said 'chicken wing'
That's a terrifying profile picture.
+Jordan Shank lol
lol
Or how terrifying it was to see that they swallowed the drumstick whole, bone and all.
Great
I gonna become a new man
*waits 7 years
Still the same man :(
Boomtime 😂
no suhc thing as same or unhappx or not, happyx nmw
Comment is 6 years old, almost there!
Because we are not the Body but soul
I expected your viewership to be a bit more educated than what I had a glance at in the section below.
Yes!!!
this!
vjm3 Did you know that turning jugs into instruments has been a thing for thousands of years?
S.A. H.
I did NOT, but it sorta makes sense I guess.
What do you mean? Questioning the use of the term "Bio-Female"?
It's a legitimate query, considering that the term is still not accepted in standard A&P texts or courses.
But since you're so well educated, you knew that...................................
I've always though this myth goes differently: not about the replacement of cells, but of atoms which make up those cells.
exactly what I was looking for here!
Me 2
Me too
If anyone is curious I also heard it as atoms from Vsauce in his video about why we feel Nostalgia here ua-cam.com/video/coGfGmOeLjE/v-deo.htmlfeature=shared&t=48 for some reason everywhere else says cells. From the way I heard it didn't sound like your body "renews" itself, you just have a constant flow of atoms in and out over time. So it took random samples over the course of decades the odds you found an atom that wasn't apart of your body before goes up, but your still suffering the biological components of aging. It's just more like the other interpretation of the ship of thesis that stats it's still the same ship even those the wood and sails got replaced.
In short: yes, but not all of it, like the brain and heart.
The ship of Theseus paradox applies very well to our bodies, apart from brain and heart tissue and what not.
EDIT: If in the Ship of Theseus you replace all of the ship except a few hooks and boards of the original ship, is it still the same ship?
so technically, no. The question was do you have a new body? so if you still have old cells of it, you don't have a new body
ship of Theseus paradox doesn't apply here really, as on that ship it replaces it with new parts, if your body did this you would stay looking younger for longer, telomeres have a big roll here.
+bottleofmtdew So, theoretically speaking, if at some point I'm able to hard-wire my brain into a large, mechanized body, would you continue to maintain that it is _not_ a new body, since some of the cells are from the very original version?
Apart from the brain and the central nerve system, the body is pretty auxiliary :P
sween187 As he said, skin replaces itself very often. It's the body's ability to actually be younger rather than the cells just sitting there till you're 70.
next episode please - you know when you have a really good fart brewing, look forward to letting it out and is just dissolves into non-existence, what's going on there?
that's really dissatisfying...
Yep.
Maybe it's re-absorbed and it's part of you now. Don't hold 'em in.
"brewing" lmao
oh. my. God.
In case you're wondering where the 7 years thing comes from, I read somewhere that it's the average life expectancy of cells, not the maximum age.
well I was interested in the video content, thanks scishow! This channel is one of my absolute favorites!
If only I could regenerate my arthritis damaged joints.
Same
Oh ;-;
:(
+Toolman329 what the crap are you on about?
+Suprise Anschluss where did cracking of knuckles come up?
0:30 "It's one of those internet myths." I remember hearing this myth from my middle-school science teacher back before the internet became a thing. Pretty sure I read about it in the textbooks, too, which were certainly twice my age at the time. So I don't think "internet myth" is entirely accurate.
Same here, I heard it had to do with allergies
*just now realizing I big dumb*
I was taught, or told it, as school in the 1960s too.
CGP Grey and Kurzgesagt also made videos about this topic. Coincidence?
Yes, it is. Funny though, that the Kurzgesagt vid specifically mentions the 7 year replacement period as (mostly) true. Unusual for them to be factually wrong.
I think this video was made so Hank could slap Grey and say that the body isn't replaced every seven years
Grey talked about Split brain - nothing to do with cells. Kurzgesagt does talk about it in their latest video.. and the video they did before. But both these topics, the split brain and cell replacement has something to do with the philosophical topic regarding identity. So Sci Show did slap Kurzgesagt.
+Tyler Durden No kurzgesagt say most of the cells, not all the cells, and that is true
I've noticed a lot of popular science channels do that, sometimes SciShow is first, sometimes not
I find it really strange that the entire internet decided to make youtube videos about this topic right now xD
I love how detailed and thorough these videos are, it was really good that you mentioned biosex females, which many people tend to overlook. It's similar to how my geology teacher always says that dinosaurs are extinct, and I feel like shouting "no! Non-avian dinosaurs are extinct; avian dinosaurs are still very much alive! Just look at the pigeon outside!"
Pigeons are not dinosaurs, they evolved from dinosaurs. I've never heard of a fossilized pigeon. Every living thing alive today evolved from something that was alive during the time of the dinosaurs.
Popping pimples: Yes or No?
no
Pop dat shit, an clean it. Acne makes you look unattractive.
Get an acne pulling tool and was your face afterwards
Hell yes. I've never had a problem with it.
***** Yeah, the social stigma is somewhat irrational than scientific. If you pop your pimples, all you have to do is CLEAN it properly. If you just leave them on your face till they get too big, THEN you get scarring because it stretches out your skin.
I see a lot of videos like this on this channel, where it says that it's debunking something, but when it goes into detail, it seems to mostly support it. While 7 years is really just arbitrary and there are some cells that aren't replaced, it sounds like your body does replace most of the matter in it over the long run, which is really the heart of the idea.
Wow this one was Soooooo Amazing ! (Not saying the others vids are bad, forget that idea ! You do a great job) but this one was great !
Thx again SciShow !
I get a new cybernetic body every 7 years, but then, I work for a top secret government agency that incorporates alien technology.
I'd like to have some of that too, thanks.
absolutezero1000 I only told you because I knew no one would believe me. Darn. How am I going to explain this to the Interspace Council?
+Christie Nel Hey, man. They'll understand! Now, I'm not saying they won't kill you, but hey. You can always get a new body
Drewbie Yeah. And they'll set the pain setting to max as they kill me. Just to teach me a lesson.
So i'm going to replace you now? lol
Oooo 23 seconds old!! thats some fresh SciShow!!!
and having watched, thanks Hank, Very Informative, I've got a bet to go win!
Is there any possibility of creating a SciShow Medicine? I love SciShow and SciShow Space, would really love a channel dedicated to medicine-related stuff every week!
Thanks so much for all the amazing content you guys put out! Really excellent work!
I loved it! Thanks a bunch Scishow (the people who produce, edit, and post the show and Hank and Michael A.). 😇
This is the level of detail that I most appreciate, enough to introduce me to new terms (covering my affinity for English and language) as well as scientific and mathematical analysis. It was almost perfect in fact, and could be justified as so, if Hank said isotope of Carbon-14 instead of type. That is a minor chemical detail that any true-bred could and would know, especially chemists, but aside from that I loved it. 👍
I do not know how much effort and time it takes to create content at this level, a lot I would assume, but even if one video a week was this effective, i would GREATLY appreciate it. 😂
I will try to being a patron, if you guys keep this up. The increase in my quality of life that this level and quality of science is unmatched almost anything else.
It's funny how all the people who usually make fun of people being easily offended, are so easily offended by the word "biosex".
Hank I am your biggest fan, you inspired me to continue a career in science
Good job on going beyond an explaining the "how we know"!!
Really cool episode, love learning all the ways science teaches us new ways to use science, quite meta!
You are reading yet another comment concerning the use of 'biosex' within this video. That is all, continue scrolling.
I used to accept this myth as a comforting self-deception. I was really struggling at the time with my feeling of present identity vs. my (oh so unsavory) past. The thought that I could be absolutely new was a great feeling to me, allowing me to shed that past and move on. The truth is not troubling; I've worked since to establish more cogent and factual reasons not to be stuck with my missteps.
I love Scishow videos! Hank is the best!!
All your cells may not be replaced, but the molecules that make up those cells are constantly being changed and exchanged. I wouldn't have the slightest idea how long it would take for you to be an entirely new set of molecules but I would imagine it happens more than once in a lifetime.
The comment section is absolutely disgusting on this video.
I'm trying to filter through the hate to find an anus joke. It's not working.
B-but... Vsauce...!
Vsauce's butt? Butt sauce?
YOLOBLOMLMTAASOSBTDPWKEOBOIODAWCHEOBOITOD still holds true.
Wasn't vsauce taking about atoms? My understanding was the same cell cycles through atoms when it takes in nutrients for energy and then releases the waste products. So the cell is the same but the atoms that comprise it are not. So it was every 5-8 years that all our atoms are replaced. Correct me if I am wrong Hank!
I think this video at least addresses how the DNA stays intact. However, it is only a small percentage of the whole cell though. I'm still waiting for an answer confirming whether the static-nature of DNA is the exception or the rule.
+woodfur00 yes
This feels very poetic.. like after a breakup you might be over them physically because everything they touched is replaced.. but your heart still hurts because it hasn't replaced the cells their personality touched (yet).
Empirical grounding - 3/10
Analogy- 5/10
Metaphorical application- 6/10
Cheese factor -7/10
Virtue signaling- 9/10
Veiled attention attempt 8.5/10
Originality - 4/10
Deepity rating - 9/10
+michael jordan not sure if I should feel flattered that you deemed it necessary to rate a comment on a UA-cam video or just be thankful it's not a troll commenting on the biosex/transgender clusterfuck further down yet.
thanks for evaluating pumpkin
i like both these comments but "thanks for evaluating pumpkin" made my day 😊
Interesting. Glad I watched.
From now on, whenever I read a "fun fact," I'm just gonna assume it's false.
Fun Fact: All fun facts are wrong!
Fun Fact: Potato
Fun fact: People eat 7 spiders a year while they sleep.*
*From the department of statistics I pulled out of my ass.
+Hal Norman Your "Fun Fact" hurt my head. Please stop.
does he basically at the video says that its not a myth its true but not in the scale that they say , right ?
So... uhh... avoiding the whole gender conversation below and focusing on the video TOPIC for a moment, I actually had heard that your body was "recomposed" of almost all of it's ATOMS every 1-7 years, not it's cells. Apparently a study was conducted in the 50's in which radioactive atoms were injected into multiple areas of the bodies and nuclear imaging studied their flow throughout (and out of) the body. Our molecular bonds slowly break down via chemical reactions, and are then replaced with an intake of water and food. And the reason we still retain our shape is because the process is gradual over time, much like the Theseus's Ship Paradox. Is this not true as well? I'm pretty sure most people were aware that not all cells are replaced every year.
They sent out Hank to answer this. You know shit's about to go down
Heard this one long before the internet was a big staple. More of an old wives' tale. Thanks for the information!
kurzgesagt lied to us
thomas mathew *Vsauce
well all the atoms in our bodies get replaced at least
When I read your comment, I was just wondering if there could be a species that uses nuclear power as body energy or something. Hypothetically ofc.
I suppose it would be nearly impossible, given how instable and dangerous it could be
LeSingeAffame Well, the circumstances for winning the lottery is also nearly impossible, but saying it's never going to happen is evidently false, right?
LeSingeAffame Plus I said hypothetically, which ignores probability. The potential benefits of being powered by nuclear energy could be more beneficial than not? So, maybe it might be an evolutionarily positive trait?
Jackboy019 It's not just about probability. It's about feasibility. The way we do it is by using fission power to generate heat, which turns water to steam which makes turbines turn. And this is basically the only efficient way we have to do it. So you would have to put that kind of thing in a living organism. Step by step. With every step bringing an evolutionnary positive trait (since you can't just bring all that thing in one generation, you would have to get it part by part, single mutation by single mutation).
Hank, I love watching you very much. My neighbor and I have decided to send you some shirts that we think would be better than some of the ones you wear. Does a costumer for the show choose your shirts for you? She or he needs to tone down the patterns of the shirts you wear. If you choose them we could help you out... LOL
hank, if i have had you as a teacher in school id have been a hell of a lot smarter by now. what a man.
Oh my goodness, they used used biosex female in the hopes of not excluding anyone or making anyone uncomfortable. It's just a shorter and easier way of saying biologically female, as some people are indeed biological female but otherwise are not. It wasn't a personal attacks on anyone's "beliefs", it's not a political move, it's still all inclusive and it basically doesn't invalidate anyone's self perception. Complaining about it isn't going to force scishow to begin using terms that exclude people. Honestly, I did not expect this from this audience, these comments are just awful, and to those saying being transgender is an illness or disorder, please do your research and think twice before saying such things.
i agree that the qualifier isn't necessary... but what is more unnecessary is people going batshit crazy over the use of the term. why doesn't anybody bring it up in a reasonable manner? i think it could be worthy of discussion, but clearly not among thin-skinned easily-offended youtube commenters.
Adding unneeded words that don't enhance meaning is bad.
+R3Testa ignorant
I luv the term. It's like would you prefer the fembot or biosex model tonight?
wow people are whiny about biosex. he only said it once too. not even relevant to the video.
It's the internet, everyone's whiney on here.
***** sadly true
apparently people don't like redefining language to make it more clear....
It's not relevant to the video, then he should not have said it...
...but you are right, it is not relevant to the video; it's relevant to the political climate of our culture which has no business in science.
curious look apparently apparently
you might want to fix that mate
Here's a question I'd like to see a video made out of:
How does fabric softener work?
Not too many videos on the subject thus far on UA-cam.
Could you make a video on the different types of cells and some unique ones? Because most people know about the basic ones like White Blood Cells and Red Blood Cells, I would like to learn something new. Thanks!
just say female.. this is a science channel
Biosex female is a scientific name
sure it is
Wow, Hank had the shocking audacity to acknowledge for half a second that trans people exist. Let's all spend a bunch of time in the comments telling people they have mental illnesses and hurling insults at each other!
It's as if people need somebody to discriminate against, for god's sake. Who could it possibly harm if trans people are allowed to live their lives fully and happily?
Hank, don't listen to all the people in these comments hurling insults at you. Being a big youtuber for so long, you probably already have pretty thick skin to this kind of stuff, but I just want you to know that all the bigots in the comments do not speak for all of us. You and your team do great work.
And to any trans person that might read this, just hang in there. People like these commenters will fade. We've seen this before with blacks and gays and women. Eventually it'll be a cause for outrage when the public hears the things they're saying. Your movement is just starting. It gets better. And know that you're on the high road here; you're not the one spewing hatred at an innocent group of people.
Thank you kind person in the UA-cam comments. 🙌
thank you, kind human, for your small haven of sanity in this comment section.
Actually, the term has more direct applications in differentiating from intersex people rather than trans people.
I thought we made the word gender for that. Feels like we need a new pc word every few months. But whatever.
+666ILIKECAKE this word is years old and here is its definition as given by the creator sexpertesse.blogspot.com/2012/03/word-of-day-biosex.html
I'm kinda glad to know this after that CGP Grey video on Transporters
Hank is back
If you're upset with Hank's use of the word "biosex," which literally does not affect your life or the point of this video, is inclusive and considerate, and is clarifying, maybe you should take some time to meditate on why this upsets you and what is so scary about trying to be inclusive and considerate to the people around us. It's not that hard to consider other people and their feelings. And if you think you know everything and know what it's like to be another person better than that person, maybe listen to The Doctor: "I’m glad you’ve got an absolute definition of life in the Universe, but perhaps the Universe has got ideas of its own."
It seems fake as fuck is what it is. Also seems like tokenism. I would also refer you to Bertrand Russell and what he had to say about feelings when making decisions in a situation.
+fmlAllthetime What exactly seems "fake as fuck"? The term biosex? All terms are just arbitrary signifiers with assigned meanings, so I'm not sure what makes a term "fake as fuck."
As for feelings not having a place in rational thinking. I think that's absurd. Feelings are one of the many very important ways we interact with the world.
Also you don't know what it's like to be another person. Period. End of story. You will never be in another person's head. You will never experience their life. And to impose the way you experience the world on other people when you are a single human being and their are billions of people out there experiencing life in different ways seems pretty closed-minded.
My goal is not to argue or have a debate. My goal is to encourage people to listen to people who experience life differently and hear them out. And to think about why this is so upsetting to you when all it does is include people and clarify what Hank was talking about.
It does affect our life.
A channel devoted to 'science' has succumbed to politics, pseudoscience, and popular opinion. How can we trust SciShow to tell scientific truths even when it is inconvenient to LGBT people or any victim group?
Now we know we cannot.
May I submit to you that what you perceive as scientific truth is, like most things, really complicated. Science isn't black and white. It's just people trying to understand the world through experimentation and observation.
Biological sex is really complicated. It's comprised of many different components, including hormones and genitals and chromosomes. And it is a myth that this is a binary. Intersex people are a thing. And people do not fit into these two categories as neatly as many people would like to believe.
Furthermore, someone's gender is a very real part of them that doesn't always conform to the sex they were assigned at birth. It's human nature to try to simplify these things. We like to understand. And binaries help us to get a grasp on the world, but they are usually not the whole picture. It's like how we teach elementary school kids that you can't subtract a bigger number from a smaller number. Sometimes we simplify to try to understand, but we lose important parts of the whole picture.
I think you will find that science and empathy are very compatible if you let yourself be open to listening to some people who experience the world in a different way from you.
(Also please note I am not a scientist. I am a literature major. But I have studied some basic psychology and gender studies, and you can access this information online easily. Hank even did a wonderful video explaining the basics of sex, gender, and sexual orientation.)
DFTBA and best wishes,
Harrison
+Anna E Please tell me you didn't just write that. Biosex is not a random PC word but literally just says females born XX and therefore highly likely fertile and with oocytes. Unlike intersex people with i.e. XXY chromosomes, most likely presenting as one gender but in many cases sterile.
Honestly people react to simply stating you are taking about biological females like sci show suggested another holocaust
he made no statement one way or the other of his opinion on trans issues, and yet people are accusing him of being an SJW. I don't understand.
he did bring up a term that has no place in biology, just for the sake of being sensitive towards people with Gender Dysphoria, so yes, social identifications have no place in factual biology.
Funny how the SJ movement is closer to the Maxism than the anti SJs are to Nazism.
But hey, let's try a class based system again, this time it got the sweet name Soical Justice or "Intersectionality" and it fights against the evil right (so everyone that dosn't agree with them)!
First time Maxism went rampant, we had the most deaths across multiable countries ever, but why should we learn from history. Let's just lable and demonize everyone we don't agree with instead of hearing them out!
I thought "female" was clear enough that we were talking about someone with two functional X chromosomes. Same for "male" and Y chromosomes. I don't see the need for the "biosex", seems redundant and clunky.
Fascinating.
I like it (everything reminded me of the Ship of Theseus). Next question: how does AC work? I feel like it'd be a good summer episode.
thanks for saying biosex female.
I am a transman but realise that biologically I will always be female and it is nice that you recognize people like me in your show. creating inclusive places are great
The term actually has little to do with trans people at all, as transgender, from the very term, has to do with gender, not biological sex. Biosex is largely meant to differentiate intersex people from male and female, as they have chromosomal differences from either of those.
The Internet: Your all idiots. You all get offended so easily.
SciShow: *uses the word Biosex*
Internet: OOHH MMMYYY GODDDDDD
Of course we get a new body every 7 years, we’re 7 years older! 🤣
When first heard this myth, it just felt wrong to me. I couldn't put my finger on it. Thank you for debunking it. Great video. Keep up the good work.
If skin gets replaced why do scars last forever?
what is a biosex female? is that a new pc term?
Except that ignores trans-gendered people and intersexed people entirely, whereas biosex female is a much more specific term
Gabriel Tzukishiro
Well I'm pretty sure that Hank and the scishow team gives a shit about them, seeing as how they could be (and likely are) in the audience
Also pretty sure that anyone who isn't a total asshole cares about them, seeing as they're, you know... people. And non-assholes tend to care about people just in general
It's just another term for 'biological female' since, scientifically speaking, not all human are divided into just a male/female binary.
So, pc = accurate.
Biosex is the term for the sex you were assigned at birth.
A transsexual is someone who identifies as a sex other than the one they were assigned at birth. So for example: a person who transitioned from female to male is transsexual (not to be confused with transvestite). Their biosex is female, and they identify as male.
My biosex is male, and I identify as a male.
Everyone has a biosex. Some people's biosex doesn't match their identified sex.
It's a clarifying term. Biosex: biological sex. Everyone has a biosex, but some peoples' doesn't match with their identified sex.
Oh, dude, my names in there! Sick!
i literally have never heard that before in my life...good to see i didnt miss anything
Make a video about the science of gender because clearly your right wing audiance is confused.
THIS
Please keep politics the FUCK out of here.
Oh, my bad, is gender not a scientific topic that is back by research and still being currently studied?
Oh, wait, it is. How about you get your assumptions "the FUCK out of here."
angelo commandatore You have evidence and research to back that up? Because I do have evidence and research to back up that gender and sex are not the same thing, and that sometimes one doesn't match the other.
+Crazy Diamond it isn't politics. It's just science.
why is this in the sci show quiz show playlist?
I heard this recently on NPR. Kinda interesting to hear it here again.
I recall another version of this where all the atoms in your body are replaced over time
I was under the impression that it was all the atoms in your body would be cycled out about every 7 years as opposed to the cells themselves.
I'm really curious as to whether you timed this video to go live with CGP Grey and Kurzgesagt's videos?
Hi guys, i have a question pumped in my head when i sow a previous episode in ur channel, about how much pixles in our vesion comparing to cameras, i hope u answer this question. Why screens seem to us in low quality throw any camera and comes like black and white?
Why am i hearing about this new body every seven years in so many videos lately
+quosmo1 and they hit while the iron is hot.
Can you please create a video on plasma globes? I am fascinated by them and don't know how they work in the slightest. I have tried google and that was no help. Thanks Scishow!
I always got confused about this myth because I was told many cells are not replaceable. THanks.
A new body every 7 years? Well I only have 1 freezer and the police get suspicious. So yes.
I've never been more relieved, this myth always freaked me out so much
all my science channels syncing up their cycles or something with this theme
I frequently drop by office parties and try to sound all smart.
And I thought waiting two years to upgrade my phone was a long wait
Certain white blood cells (B-lymphocites as far as I remember) have also quite a long lifespan. Those are the cells which remember the antigens of certain pathogens. That's the way you can get life long immunity against certain diseases like chicken pox.
(Correct me if I said something wrong)
Hey guys, do you still perform SciShow Experiments? If you do, could you do the Michelson-Morley experiment? Thanks!
What about the phenomenon where people's immune systems change every 7 years (give or take)? Like being allergic to something when you were younger but not being allergic to it later in life, or the fact that I could have all the bread and cookies I wanted when I was a kid, but as of a couple years ago, suddenly my body thinks gluten is the devil and must expel it whenever I eat any now?
Thnaks for mostly helping debunk my question. My actual question was a but more specific...does our body chemistry change on the average every 7 years?
Hank were you in Cyberchase?
can you do a video of why i sweat, why other people sweat more then me?
when we donate blood, how fast do we make new blood to fill? Thanks.
SCISHOW CAN U DO A VIDEO ON CEREBRAL PROSTHESIS AND IF IT IS POSSIBLE AT ANY POINT IN TIME AKA GHOST IN SHELL , I WAS ARGUING WITH A COWORKER ABOUT ITS POSSIBILITY
CrashCourse Philosophy 18 & 19 brought me here. Body theory for life.
speaking of regeneration...
Recently I went to the ER to get some glass out of my jugular vein (yes I'm okay now), the doctors said I sliced a bunch of muscles in my neck they had to stitch back together, but that got me thinking: how in the world do you stitch together muscle? Aren't those cells really long? And how to they know how to rearrange themselves back together? It's been a few weeks since the accident and although they're sore and not very strong, I can move the muscles in question, so obviously they ARE regenerating, but how?
I heard this idea in grade school in the sixties, so it would precede the Internet!
any link to your scientific speech? like any scientific paper in Nature journal or what ever?
Do a video on fermented foods like kombucha and saurkraut. Do these "live" probiotics survive to be beneficial in your gut?
I just searched "is regeneration possible"
I honestly find that idea really creepy. Like, every seven years, you aren't you anymore
So one brother is basically a scientist and ones an author, nice
This was very interesting. I never thought that myth was true, but now I'm glad I have some proof.
Nice one. But what 2021 new finding says.. it is same or the new research is made out.? What about skeletal muscle cells. How often is it replaced..?
hey scishow! why do food and drinks taste different immediately after brushing your teeth?
Based on the chains around here, looks like we need a SciShow about Transgender.
I had never heard about this taking place on the cellular level. I heard that all (or rather, atleast most) of the atoms that make you up, are replaced.
I feel like it's not really fair to answer that question like this, by only looking at our bodies on the cellular level.
Every living cell is constantly absorbing new nutrients and ejecting waste; so yes in the cellular level your brain and heart might be the same, but that's not really fair since on the molecular level the matter that composes these cells have completely changed.
My class got told that all your cells are replaced every 7 years by a biology teacher in GCSE biology. Great job.
We had to color in pictures...in AP Bio...multiple....Many times-that was pretty much all we did: color in labeled printouts of basic structures. If you objected, you got passively aggressively punished.
In a class made up of kids who were planning on going to med school.
So that was fun.
Me, watching this video 7 years after it being uploaded
what i was wondering is those cells do mistakes and we get older/worse or does this change makes us slightly different like our jawline changes, feelings or chemicals interactions in our body