Small Intestine

[joonkimdds]

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Kaplan says
"Most digestion in the small intestine occurs in the duodenum."

Barron says
"Food is broken down in the duodenum, but the nutrients of the food are absorbed in the other parts of the small intestine; the jejunum and the ileum"

Does this mean physical digestion occurs at duodenum but chemical digestion happens in the jujunum and the ileum?

I thought physical digestion occurs in oral cavity and stomach.

 

[DrBowtie]

Chemical digestion via amylase,lipase,trypsin,chymotrypsin secreted by the pancreas occurs in the duodenum. Once everything is broken down into monomers and such, they are absorbed by secondary active transport in the latter two regions.

 

[joonkimdds]

Chemical digestion via amylase,lipase,trypsin,chymotrypsin secreted by the pancreas occurs in the duodenum. Once everything is broken down into monomers and such, they are absorbed by secondary active transport in the latter two regions.

Awesome thanks.
5000+ post, sweat~
Amsie is not my idol any more 🙂

 

[tinman831]

Amsie is not my idol any more 🙂

Better hope she doesn't read this post.

 

[joonkimdds]

Better hope she doesn't read this post.

U used to be my idol until Amsie showed up

 

[fancymylotus]

U used to be my idol until Amsie showed up

😱 NO MORE HELP FOR YOU!

 

[tom_servo_dds]

Kaplan says
"Most digestion in the small intestine occurs in the duodenum."

Barron says
"Food is broken down in the duodenum, but the nutrients of the food are absorbed in the other parts of the small intestine; the jejunum and the ileum"

Does this mean physical digestion occurs at duodenum but chemical digestion happens in the jujunum and the ileum?

I thought physical digestion occurs in oral cavity and stomach.

http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/G/GITract.html#pancreas

NO MORE SOUP FOR YOU!

 

[DrBowtie]

😱 NO MORE HELP FOR YOU!

Lynch Amsie!

 

[fancymylotus]

Lynch Amsie!

BB's been acting suspiciously and voting to lynch innocent villagers-I think he's the werewolf. Lynch BB!

(can you imagine a bunch of neurotic pre-DAT kids trying to play forum strategy games? werewolf is the reason for my 4K posts)

 

[DrBowtie]

BB's been acting suspiciously and voting to lynch innocent villagers-I think he's the werewolf. Lynch BB!

(can you imagine a bunch of neurotic pre-DAT kids trying to play forum strategy games? werewolf is the reason for my 4K posts)

Pretty sure they would lynch themselves in confusion.

 

[fancymylotus]

Pretty sure they would lynch themselves in confusion.

 

[Ething]

Kaplan says
"Most digestion in the small intestine occurs in the duodenum."

Barron says
"Food is broken down in the duodenum, but the nutrients of the food are absorbed in the other parts of the small intestine; the jejunum and the ileum"

Does this mean physical digestion occurs at duodenum but chemical digestion happens in the jujunum and the ileum?

I thought physical digestion occurs in oral cavity and stomach.

Joon.....you study too much. This question will not be on your dats.

 

[mightymouse23]

FYI, additional digestion for some items does occur in the duodenum- things like fats. Also, if the chyme is somewhat acidic, then secretin is released to neutralize it before it passed to the ileum.

 

[joonkimdds]

FYI, additional digestion for some items does occur in the duodenum- things like fats. Also, if the chyme is somewhat acidic, then secretin is released to neutralize it before it passed to the ileum.

then do i need to know
Cholecystokinin that stimulates the release of bile

or

Enterogastrone that slows down the stomach's musular movement for fatty food?

or am i studying too much?

 

[JohnDoeDDS]

you have to know the CCK stimlates the relase of bile from gall bladder...

By the way can someone break the cels down. Like the chief cells secret something that causes the parietal cells to secret HCl, etc...

 

[aranjuez]

Secretin does not neutralize directly. It's released when the acidic chyme comes in, and its target is the pancreas, while as a result releases bicarbonate, which then neutralizes the acidic chyme.

aranjuez

 

[aranjuez]

you have to know the CCK stimlates the relase of bile from gall bladder...

By the way can someone break the cels down. Like the chief cells secret something that causes the parietal cells to secret HCl, etc...

Don't know if you have to know it in this much detail, but here it goes...

Food arrives in the stomach after being made into bolus in the mouth and moving down the esophagus through peristalsis. The food's presence in the stomach activates stretch receptors, which triggers the medulla oblongata to signal the stomach to secrete gastrin. The presence of gastrin signals a production of pepsinogen. HCl converts pepsinogen to pepsin. Pepsin breaks down proteins.

And life goes on...

aranjuez