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Implantation | Behavior | MCAT | Khan Academy

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Created by Jeff Otjen. Watch the next lesson: https://www.khanacademy.org/test-prep/mcat/behavior/human-development/v/germ-layer-derivatives?utm_source=YT&utm_medium=Desc&utm_campaign=mcat Missed the previous lesson? https://www.khanacademy.org/test-prep/mcat/behavior/human-development/v/early-embryogenesis-cleavage-blastulation-gastrulation-and-neurulation?utm_source=YT&utm_medium=Desc&utm_campaign=mcat MCAT on Khan Academy: Go ahead and practice some passage-based questions! About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s MCAT channel: https://www.youtube.com/channel/UCDkK5wqSuwDlJ3_nl3rgdiQ?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
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Текстовые комментарии (44)
Raver Since90s (1 месяц назад)
Thank you
Glory Mogoru (2 месяца назад)
Have an exam in few hours thankz a lot
Lakhdeep Singh (6 месяцев назад)
Julia Ketelhut (10 месяцев назад)
Thank you!
Khadija Hussein (11 месяцев назад)
ChocolateLover (1 год назад)
That's so interesting! I'm happy I chose medicine.
Flevis Waindim (1 год назад)
What software is this??? Help
Dixel (1 год назад)
zona pellucida sounds like Lollapaloza. It's a great festival!
Rubiya Mdr (11 месяцев назад)
Dixel 😂
BeautifullyCreatedByYAH (1 год назад)
I like your explanation of it all...thanks!
Valeska Schacht (2 года назад)
Fucking awesome! Thx
allyza Kate (2 года назад)
TTTTrying tо Cоncеive?Discovеr thе #1 Mistаke CooооuplesМаkе When Trуing tо Cоncеivеhttps://twitter.com/0b95104f6e261e609/status/783200219605245952 Impрpplantation Bеhaviоr МCАT KККhаn Accсаdеmу
sonali rai (2 года назад)
amazing !!
Jesse Pollom (2 года назад)
When because was the newest, not if when besides the trophoblast
Renzo Khov (2 года назад)
is the morula and blastocyst have the same size ?
Lucian Lupas (2 года назад)
Great video !
Kamelija Horvatović (2 года назад)
You did a great job but it's not totally correct, you kind of put the wrong picture to some things. There was nothing about the formation of lacunae in syncitiotrophoblast, the actual primary vili are formed far after the uterine blood start flowing through lacunae and the uterine vessels don't actually grow or move like that, the syncitiotrophoblast is growing and producing proteolitic enzimes which degrade the vessel walls so the blood starts pouring into the lacunae. I know it is hard to draw it like that and everything and you did a really good job on everything else.
Admiralx S (1 месяц назад)
+Toon Callens Then how does the fetus get's its nutrients
Toon Callens (1 год назад)
Actually, studies have shown that there is not a real circulation of maternal blood until third month of pregnancy. The lancunae are not filled with blood so early in pregnancy.
khadija alkiyumi (2 года назад)
omg.....please make more videos, i was trying to study this for around two weeks, but could never really the the picture of it! truly its not as detailed as what im studding, but you need to get the basis in order to understand the details. Thanks, and please continue making videos.
A-r-d-a (2 месяца назад)
turtlewearsahat (2 года назад)
Very good - but I thought that it was the proliferating cytotrophoblasts which actually invaded (becoming the extravillous trophoblast)as opposed to the syncytiotrophoblasts. Anyone know for sure?
Toon Callens (1 год назад)
Turtle is right, the villi are formed from the cytotrophoblast that invades into the syncytiotrophoblast. But a lot of steps are not in this video, primary villi form on day 13 = almost very end of implantaion. By then, the amnion, chorion,... Are already formed.
Kamelija Horvatović (2 года назад)
The syncitiotrophoblast is the outer layer of trophoblast and it is the one degrading the endometrium.
Shana Geetha (2 года назад)
wow!! the stuffs that had been taught in lectures for two weeks !!! this videos made me understand the whole process in few minutes !! thank you so much!!
Mel Wang (2 года назад)
Thank you so much for the explanation, it is so detailed and thorough. One question though, how long does the whole process take in general? Thanks a lot!
abdou 11 (3 года назад)
thank you thank you thank youuuuu
Wow nice, just one thing - where does blastulation tie in with this? Does blastulation and gastrulation and neurolation all occur prior to implantation or is there some overlaps?
Oktay Berkay (5 месяцев назад)
Ur nickname makes me laugh like crazy LOL
Alex Paul (1 год назад)
mErDzKy09 (1 год назад)
When the embryo is in the blastocyst stage, that usually marks the end of blastulation. The moment the blastocyst is implanted and burrows itself in the maternal endometrium, gastrulation is initiated, forming the three germ layers which will then differentiate into the different organs of an organism.
Josh McKenna (2 года назад)
savita sinha (3 года назад)
James Filosa (2 года назад)
+savita sinha - Eggcellent. Standing ovumation!
west delooz (3 года назад)
well done!
Umar Khan (4 года назад)
you realy explained the placenta well. thanks!!! - via YtPak(.com)
Linges Hels (4 года назад)
So a foetus is basically a parasite?
Danielle Gulley (2 месяца назад)
Yes a beautiful parasite lmao
sfrtcw ftw (2 месяца назад)
Lamppis  we are parasites
Remesah Noor (1 год назад)
Parasitic relation is only between two different species . Like a hook worm is a parasite for humans . But a fetus is not a parasite.
Shie H. (1 год назад)
Linges Hels Yes. It is.
Josh McKenna (2 года назад)
+Linges Hels Interestingly, most of my professors and colleagues jokingly refer to developing embryos and fetuses as parasites. There are many types of implantation and placentation; humans develop hemochorial placentas, meaning the embryo completely destroys the maternal spiral arteries in order to form large blood pools (called lacunae) in which the fetal chorionic villi (leeching fingers of trophoblast tissue) float to obtain nutrients and oxygen from maternal blood. Various other species have less invasive placentation patterns such as syndesmochorial placentation, in which this kind of blood vessel destruction only occurs at some spots along the placenta rather than the entire fetal-maternal interface.

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