Spermatogenesis | Reproductive system physiology | NCLEX-RN | Khan Academy

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Created by Vishal Punwani.
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Опубликовано:

1 фев 2015

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Комментарии : 81

@martindagoat3909 4 года назад

Another function of the tight junctions is to protect the haploid cells from our own immune system because they only have half the chromosomes so the body thinks it’s foreign.

@SR-hl5vz 3 года назад

stfu martin

@maemueller3962 3 года назад

thank you martin :)

@navaneeth_us 3 года назад

That is called as BTB: Blood testis barrier.

@lcdp9459 Год назад

Yes! If you watch Ninja Nerds video on Speematogenesis, you will find that information there. He speaks on that in his video. That’s why it’s important to watch a few different video’s when learning this material! 😊

@Simp_lee1 Год назад

@@navaneeth_us oh

@IceDr4gonfly 9 лет назад

I just stumbled upon one of your old videos from 2012 about inotropic effect on the heart. Then, I started watching your other videos and now I'm a subscriber and will share your videos on my FaceBook page. You are one hell of a teacher!

@luvisacigarette8 7 лет назад

All too often, this gets negated when one first learns about meiosis; ie, first there's mitosis of cells that give rise to meiosis. Thank you so much for the great explanation.

@joasiaa8130 6 лет назад

You have a good calm voice, It's kind of better to understand everything because of that (Y)

@aminaa77 2 года назад

one of the clearest and most straightforward vids i’ve ever watched. thank you so much!

@ishan0369 7 лет назад

HELL YEAH! IT'S JST AWESOME THANK U SIR FOR THIS BEAUTIFUL EXPLANATION!!✌

@user-ge6dk8yn3z 10 месяцев назад

after 8 years , you just safed me !! i'm in my last year and you just answer all my questions , thank you so much

@danielm.4346 4 года назад

Awesome. Thank You. How about, please, some information on the stories of people's observations and discoveries of all this?

@sachingowda2618 2 года назад

Awesome video 🙌🏻 Another point, the tight junction forms the Blood Testis Barrier (BTB) to prevent the immune system to attack on newly formed secondary spermatocyte (as they are haploid)

@martinahejnickova3090 8 лет назад

Thank you, very helpful!

@mrabukarak 9 лет назад

Simply amazing :) , after watching some of your videos SIR i have subscribed and i basically watch every video u make , so please keep up the AMAZING work and discuss as many subjects as you can because you are doing students all over the world an AMAZING favor :).

@alexvidu4517 4 года назад

Winner of a video, been searching for "how to sustain an erection" for a while now, and I think this has helped. Have you heard people talk about - Meyylan Konophia Theorem - (just google it ) ? Ive heard some super things about it and my neighbour got cool success with it.

@callospaziale 4 года назад

The right junction between basal and ablumenal is correctly named blood testis barrier, i case you want to dig further more. :)

@lostsidedkm 3 месяца назад

thanks buddy

@majadabaid8483 4 года назад

Great videos! Many thanks.

@joshuamedrano6921 6 лет назад

Simple. Thank you.

@honeywaghela3058 3 года назад

Cant appreciate enough! Thank you Sir

@matthewswartz1353 5 лет назад

Great video Vishal and Khan Academy! Super helpful

@sleepies5741 7 лет назад

Thank you ,it's very helpfull

@rayenahmed5456 Год назад

I've been struggling with this topic and this video made it so clear, especially in the part where the number of chromosomes was explained. Thank you!

@francescascarionati113 6 лет назад

Great video, thank you very much!! (:

@truetrue4521 7 лет назад

Great video thank you!

@belfagor80 6 лет назад

Amazing and effective work! Well done. Keep it up. And Thanks :D!

@lifeofveniceandtahana9907 3 года назад

This video is excellent !

@aaaa8784 6 лет назад

Thank you so much! Now, onto oogenesis!

@kieranfitzgerald7044 8 лет назад

Nice!

@rafa-io9uz 3 года назад

Very helpful!

@IchsanulIqbal-yv2ip 2 года назад

great video.

@hegotthequaytomyheart3641 3 года назад

Thanks

@rachelslater3295 4 года назад

very nice video!

@tipsandtricks8524 2 года назад

well explained! this content creator should receive salary instead of some teachers who don't even teach..

@hafeezagul3487 7 лет назад

nice

@ezejoseph3788 3 года назад

From 4:20 Is there any pathological conditions where the spermatogonium divides and both differentiate, leaving no spermatogonium behind

@jlh4jc 5 лет назад

Please don't use squeeze and testes in the same sentence. Gives me the heebee jeebees! LOL!

@ilmarabbayani8407 7 лет назад

when it becomes spermatosit primer, why the cell can be bigger than before?

@Grits420 8 лет назад

hi I have it written in my textbook that the second split of the sperm cell is still mitosis. I think this is contrary to your video where you indicate it is meiosis and first meisos division doesn't occur till after primary spermatocytes . Can you please confirm this or do I have it incorrect? I feel like you might be slit in mitotic proliferation?

@kathleenmulvey1770 8 лет назад

+Grits420 The first split is mitosis, the second split is meiosis 1, followed by meiosis 2 being the third where the immature sperm cells are formed

@mohamedmekkawi5757 6 лет назад

Can anyone tell what kind of software programs are used to produce videos like this ? is it a simple paint program maybe or something else?

@onetwoBias 6 лет назад

Mohamed Mekkawi i think it's called yahoo doodle or something like that

@reyan24 6 лет назад

thanks

@mroosie7488 5 лет назад

Excellently explained

@Sarah-kg9zj 7 лет назад

this video is amazing

@UHFStation1 Год назад

Where does sperm DNA come from and how does it get damaged over years since they gets replaced very frequently? Why do Yamanaka factors not bring reproductive cells to pluripotency?

@chidiagbo1693 2 года назад

Please always try to improve your voice volume

@SmokingPhoenix85 4 года назад

One comment on the 2nd meiosis relative to 1st meiosis. The 1st meiosis goes from 1 diploid cell (46 chromosomes pairs) to 2 haploid cells (23 single chromosomes), the 2nd meiosis goes from 1 haploid cell (23 single chromosomes) to 2 haploid cells (23 single chromosomes). Making 4 spermatides from 1 primary spermatocyte in total. I understand if this is what you are trying to make a point out of, but its a bit obscure to people who only watch this video. There are still 23 singles in the 2nd meiosis, as it was in the 1st, why comment that there is 23 singles in the 2nd, like there would be a difference when there isnt? Why is it not mentioned that there is a 2nd meiosis? (its only written and highlighted once and not for both meiosises)

@Painx7 7 лет назад

Please note this video contains sexual content? tf lmaoo

@shivanishastri4285 6 лет назад

I knew someone was gonna mention this

@Adam393h 6 лет назад

Me to 😂

@hayatsatre465 6 лет назад

did'nt it say sexual HEALTH content?

@andersnelson6464 4 года назад

Had to turn back

@rifanbudi34 4 года назад

Human creation in Quran وَلَقَدۡ خَلَقۡنَا ٱلۡإِنسَٰنَ مِن سُلَٰلَةٖ مِّن طِينٖ We have created man from an extract of clay. (Surah Al-Mu'minun, verse 12) ثُمَّ جَعَلۡنَٰهُ نُطۡفَةٗ فِي قَرَارٖ مَّكِينٖ Then We made him a sperm-drop in a firm resting place. (Surah Al-Mu'minun, verse 13) ثُمَّ خَلَقۡنَا ٱلنُّطۡفَةَ عَلَقَةٗ فَخَلَقۡنَا ٱلۡعَلَقَةَ مُضۡغَةٗ فَخَلَقۡنَا ٱلۡمُضۡغَةَ عِظَٰمٗا فَكَسَوۡنَا ٱلۡعِظَٰمَ لَحۡمٗا ثُمَّ أَنشَأۡنَٰهُ خَلۡقًا ءَاخَرَۚ فَتَبَارَكَ ٱللَّهُ أَحۡسَنُ ٱلۡخَٰلِقِينَ Then We turned the sperm-drop into a clot, then We turned the clot into a fetus-lump, then We turned the fetus-lump into bones and We clothed the bones with flesh; thereafter We developed it into another creature. So glorious is Allah, the Best of the creators. (Surah Al-Mu'minun, verse 14) Thanks