Absorption in the Small Intestine

[@MrPollockBiology]

This video is a re-upped version... In the previous video I had stated that the Na+/Glucose cotransporter was an example of active transport...which it isn't...no ATP required. Sorry for any confusion caused!

[@hellothere3683]

Ahh no problem :)

[@MrPollockBiology]

cheers :)

[@DNLNaNaLiZa]

ahh, it's actually a Secondary ACTIVE transport according to Medical Physiology by Boron and Boulpaep 2nd edn, page 937 ^^,

[@clasherclasher317]

DNLNaNaLiZa It's an active transport but doesn't require ATP. Instead I believe it uses energy store in the concentration gradient to move the secondary molecule

[@suhail1200]

Glucose moves with the sodium from a low to high conc.I know it squeezes through but isn't that active transport?

[@Ravioliyt]

Awesome videos! Since the Corona virus has shut down all schools in England, as a year 12 A level student we still have to study and learn in our own. These videos are perfect for learning from because they're really clear and efficient in explaining.

[@Firewolf_Daimyo]

I'm glad someone taught me this because I was just given a worksheet and expected to know what to do. Life saver!

[@sophielaw7231]

wow! Thank you sooo much for this video!!!!! I really didn't understand this at all before but now it makes perfect sense!!!

[@MrPollockBiology]

+Sophie Law Glad it helped!

[@damanveerchahal]

Thankyou so much, I finally understand the topic for my presentation from your video.

[@maishehab3329]

Just discovered your channel... and I finally get this. Thank you!

[@herenmarz5839]

Great video! made this concept so much easier to understand. Greatly appreciated :)

[@lcbingham1007]

ur actually a legend this has helped me SO much

[@Hugo-ym3oq]

Thank you for explaining clearly!

[@meet6285]

Thank you so much ^-^ ive been confused on co-transport for ages and now i finally understand it !

[@LowCarbHealthMD]

Can you pls correct your Na-K pump segment to minimize confusion? Na gradient should be this: higher extracellularly, lower intracellularly. So that means for the Na-K ATPase, it actively transport 3 Na from inside to outside the cell, as well as 2 K from outside to inside the cell. This maintains the resting membrane potential. Thanks!

[@jiaqili7766]

This is so clear!!! Thank you for sharing.

[@sobster123]

thanks dude, really helped summarize it for todays exam>:)

[@siddharthgupta9801]

wow you just cleared all my boubts.... thank you very much

[@adrevenue4329]

your video was amazing thanks so much

[@Tanushkaborthakur]

Very much helpful... Thank you

[@mohammedal-shirawi8691]

thank you for that it was helpful but the sound is so low

[@esraa2939]

thanks alot it's facilitated my study

[@astolfo9377]

EXAM TOMMOROWWW I LOVE YOU SO MUCH YOU ARE A GOD

[@rimehsalhi8223]

You ara a god ??? WTF the god IS one there is no other god استغفر الله

[@zhwart.hassan2199]

Thanx very easy to understand 🤠

[@fatmaammar5635]

Really helped, thank you!

[@alexwong922]

Hi MR. Pollock, I am a bit confused because my lecturer told us that Na+ are pumped back out of the epithelium cell by the Na+/K+ pump. It means that Na+ are bumped back to the lumen. However, in your video, Na+ are going in the bloodstream. Could you tell me more pleases?

[@LowCarbHealthMD]

Na gradient should be this: higher extracellularly, lower intracellularly. So that means for the Na-K ATPase, it actively transport 3 Na from inside to outside the cell, as well as 2 K from outside to inside the cell. This maintains the resting membrane potential.

[@alesandrom5636]

Awesome 👏 😎

[@nyawirawaithaka4993]

Very well explained. Thank you!

[@zer0days392]

It was a good one.

[@satyasnigdhatripathy2018]

Thank you very much

[@Hameed410]

Thank you .... Very well explained

[@MrPollockBiology]

+Mohammed Hameed shareef Cheers!

[@TheWarriorLP16]

Thank you very much! You saved my day

[@user-wz8sx6pj3i]

OMG YOU are amazing thank you!!

[@assemubigaliyeva5872]

Thanks bro, I get it now. So well explained

[@AG-ql1sy]

hi sir, surely the active transport occurs before the cotransport? because wont the removal of sodium ions set up the concentration gradient, thus the sodium in the lumen will diffuse with the glucose molecule

[@ham2ah]

Hi Mr Pollock,I'm struggling with unit 2 AS Biology. Need help with understanding the cell cycle, meiosis, mitosis and genetic variation with bacteria 😊please make videos?

[@MrPollockBiology]

Hamzah413 Cell cycle, mitosis and meiosis vids all uploaded!

[@thilinaalagiyawanna3680]

Thank you very much. I think Sound level is very low. Anyway thank you.

[@Goodfellas981]

Where does potassium go after?

[@anxhelo8649]

thank you so much!

[@TheOlgaStudio]

You say that Co transport is an example of passive transport, but isn’t it in fact secondary active transport? Sodium ions are translocated using ATP, and by co transport the glucose can be absorbed.

[@DrAgam.]

very good explaination

[@mardenidres]

Thankyou very useful

[@nazanin.zkeshvari1316]

thanksss so useful for me

[@virtutepuella7766]

very helpful. a bsc nursing student🤗

[@katied4286]

I completely understand now!!

[@Fran-xf6yf]

Thanks for this video it has really helped. I was just wondering why is there a higher concentration of glucose in the outside of the lumen compared to inside the lumen? why is there a low --> high concentration gradient with glucose becasue surely there would be a lot of glucose in the inside of the lumen of the small intestine (due to the breakdown of foods) compared to the outside of the lumen?

[@i_am_gods_child]

this was sooo helpful thankyou!! I have a test on unit one tomorrow and it feels really good to finally understand this 😁

[@hellothere3683]

Is there a difference between this video and the one with the same title that was deleted? Thank you!

[@jakesatov7454]

Hey, thanks for posting.. I'm not far enough along in my nutritionist certification to understand cotransports and the like, but I am working on trying to understand the roles of enterocytes and villi/micro-villi. Unfortunately the text I was given doesn't give me much in terms of visual aid to understand what it looks like and how it lines the small intestine and therefore how to understand it's function. The start of your video with the bisection of the intestine was so helpful. If you have a video that just discusses enterocytes and villi, would you be so kind as to post a link? Thanks again!

[@jakesatov7454]

Interestingly in trying to find more info, it looks a lot like nobody else has shared such a simple and helpful view of the intestinal brush border. Though I finally figured out what I need to. The enterocytes are the whole cells and the villi are the finger like parts of that cell. My mind almost exploded

[@BlueSky-lc4gx]

What about water transport from lumen into blood?

[@mohammedsadekon]

where do the potassium ions go after the process ? do they accumulate in the epithelial cells of the small intestines ?

[@MafiaDiesel]

K+ inside the cells passively diffuse to the blood stream again because there is a low concentration of K+ in the blood compared to the cells. that's why the Na+/K+ pump maintain that unbalance by getting K+ inside the cell and Na+ out.

[@jacktully5651]

great vid buddy

[@molad7669]

You said sodium moves actively in sodium potassium pump but you showed that sodium is moving into the blood stream from high concentration gradient to low concentration gradient which is basically facilitated diffusion, could please Make me less confused

[@d3proX12]

You are a god

[@user-bb2mf4vd2o]

Thank you , very helpful!

[@antoninomineo8644]

Isn't SYMPORTER a secondary transport, so an active transport.?

[@FatimahA]

Thanks!

[@nyawirawaithaka4993]

Thank you!

[@naqibshami2696]

Thanks

[@beckwilde]

THANK YOU!!

[@agnibonendasari3814]

thanx

[@moshyalemam3954]

The voice is not clear but great contant

[@azitakolahi2122]

Thanks bro

[@mohammadayoub3711]

After digestion, during absorption isn't there more glucose in the lumen of intestin?

[@Anonymous-fj2uo]

That's what I was wondering! By I'm guessing there is more glucose in the lumen at the start but after normal diffusion the concentrations in the lumen and in the cell levels out. That's where co transport comes in to push the remaining glucose out of the lumen. I hope that makes sense

[@Anonymous-fj2uo]

*But

[@Nah-id-win610]

God bless you. Ty so much. XD

[@PankajYadav-li5nr]

Sir volume is low😟

[@shabnumrashid5240]

can u please make video on unit 5 essay questions

[@shabnumrashid5240]

2016 spec unit 5

[@oneummah7120]

😍

[@lewiswhitehouse853]

Yo lydia

[@abdullahafzal5264]

You're a don

[@jatherinak7330]

you are damn soft. i could barely hear anything??!

[@mashaelm6302]

Thank you so much