Small intestine 3: Absorption | Gastrointestinal system physiology | NCLEX-RN | Khan Academy

Created by Raja Narayan.
Watch the next lesson: www.khanacadem...
Missed the previous lesson? www.khanacadem...
NCLEX-RN on Khan Academy: A collection of questions from content covered on the NCLEX-RN. These questions are available under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License (available at creativecommons....
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 NCLEX-RN channel: / @khanacademynclex-rn7898
Subscribe to Khan Academy: www.youtube.co...

[@melangehans]

Secondary transport in the way you present it for carbohydrate absorption would result in an enterocyte filled to the brim with sodium.. The enterocyte actually pumps sodium out of the cell with sodium potassium ATPase, not as an antiport with glucose as shown in the video. This is important, since to create the concentration gradient needed for the secondary transport of glucose from the lumen, the sodium concentration in the enterocyte MUST be lower in the enterocyte than in the intestinal lumen. I really like these videos and you're a great tutor, but this is a rather big error.

[@onetwoBias]

you beat me to it! :)

[@youtuber-nx5en]

Thank You, for informing!!! :))))

[@me430at]

I am also confused, shouldn't amino acid transport be secondary active transport energised by sodium gradient? This is what Constanzo book says.

[@sali11629]

Yes, my lecture notes also state that Na+ is pumped out of the enterocyte in exchange for K+; this is what creates the concentration gradient needed for Na+ to flow down along with Glucose through the SGLT1 transporter

[@lord.r4290]

I think there is something wrong here.. amino acids can transport inside the cell the same as glucose.
resource :
Guyton and hall medical physiology .

[@youtuber-nx5en]

Thank You, for informing! :)))))

[@lord.r4290]

@@youtuber-nx5en Wow! that comment is too old.. I graduated from medical school already 😂 .. Anyhow, you are welcome :D

[@youtuber-nx5en]

@@lord.r4290 Glad, to hear that you graduated from the medical school. Best of luck for your future! :)))))

[@lord.r4290]

@@youtuber-nx5en thank you for your kindness. best of luck for your future too

[@isaacbrown5311]

@@lord.r4290 please tell me is gets better

[@chriss.1511]

Single amino acids actually enter coupled to cotransport of Na+ not ATPase pumps. So that’s secondary active transport. Note: dipeptides and tripeptides cotransport into the cell with H+ ions where they are usually broken down to single amino acids

[@karolgilbertosolanosuarez9094]

Cab the AA also be cotransported with Na+?

[@helenesanderson8902]

It's amazing how much we know about anatomy and physiology and even biochemistry...yet doctors do not treat your body system like your at all connected to many processes and have a tendency to just focus on one symptom.

[@christinevakas92]

Awesome. Listening to these two videos was a great combination and helped me to visualise the process well. Thank you for sharing your teaching talent with us.

[@mohammadayoub3711]

Sugar is transported to the enterocytes by co-transportation which is aginst concentration gradient But Not from high to low concentration gradient.

[@rasaqadebiyi6155]

the stomach parietal cell also secretes intrinsic factor for vit b12 absorption, and chief cell also secretes gatric lipase

[@Johanna-qf1yx]

Can something like Sibo cause malabsorption of amino acids and fatty acids ?

[@ndukanwankwo8393]

Thanks

[@helencats1]

Amazing. Thank you

[@oriarahamim9622]

what about the ileum🥲

[@mohammadamiri8596]

Im studying this in class 9 it feels bad :( but your vid help me

[@weebleapplesmooooo]

I was taught that most absorption takes place in the ileum

[@sami.1]

Same here! That's where the villi are located, right?

[@leutrimshabani47]

Sami Raza Sean Ngui , vili are located in all parts of small intestine, whoever told you that most absorption takes place in ileum was wrong. However there are some mistakes in this video for ex. aminoacids(cotransport with Na+), dipeptides and tripeptides(both cotransported with H+, faster than aminoacids) are transported with secondary active transport. Also secondary active transport is not how he describes it.

[@onetwoBias]

Most absorption happens in the Jejunum, and the the degree of absorption gradually fades as you progress towards the anal end of the small intestine. This makes sense, because at first there's a lot to be absorbed, and the amount still left gradually decreases, rather like in the nephrons where the majority of the totalt reabsorption happens in the PCT rather than the colleting ducts. Also the Jejunum, unlike the Ileum, has plicae circulares which help to increase the surface area, such that more absorption can occur, whereas the plicae circulares gradually decline as you progress anally to the ileum.

[@Depths17]

I'm so confused

[@fofafofa3502]

🧚‍♀️

[@tomsherwin7077]

As a brit, your pronunciation of duodenum is absolutely hilarious. DuAdoNUM :D

[@suzanneking6260]

DUOdenum........we roar hysterically at US pronounciation too ;)