Bio question: Vitamin k absorption

[krazchikin]

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hey guys, needed help on this question:

Vitamin K absorption occurs mainly in the:
a. duodenum
b. jejunum
c. stomach
d. large intestine
e. mouth

it's definitely not in the mouth or stomach....i tried googling, but all it says is that it occurs in the intestine, and doesnt specify which (although i did find something that said vitamin K is synthesized in the large intestine).

Also, another question i didnt know: organisms of which of the following phylum use "tubular feet"
a. platyhelminthes
b. coeloenterates
c. echinoderms
d. arthropods
e. chordates

Thanks ahead!

 

[phospho]

hey guys, needed help on this question:

Vitamin K absorption occurs mainly in the:
a. duodenum
b. jejunum
c. stomach
d. large intestine
e. mouth

it's definitely not in the mouth or stomach....i tried googling, but all it says is that it occurs in the intestine, and doesnt specify which (although i did find something that said vitamin K is synthesized in the large intestine).

i'm not 100% positive, but i am pretty sure it's the jejunum:

check this wiki article out:

http://en.wikipedia.org/wiki/Jejunum

"The transport of nutrients across epithelial cells through the jejunum and ileum includes the passive transport of sugar fructose and the active transport of amino acids, small peptides, vitamins, and most glucose".

Also, it's not the duodenum since (if i remember correctly) only b12 and iron are absorbed there...

no clue about your 2nd question😀

good luck!

 

[nealofgrafton]

ecinoderms have tube feet. look at the bottom side of a star fish

 

[PreDent08]

it's been 1 yr since i studied for the DAT, but i remembered vitamin K was reabsorbed in the large intestine. so yea D should be the right answer.

and yea echinoderms(star fish) has tube feet.

 

[NyCzPeter]

I am 99% positive #1 is large intestine which is mostly for Water and Vitamin K absorption. Don't know about #2

 

[PDizzle]

i'm not 100% positive, but i am pretty sure it's the jejunum:

check this wiki article out:

http://en.wikipedia.org/wiki/Jejunum

"The transport of nutrients across epithelial cells through the jejunum and ileum includes the passive transport of sugar fructose and the active transport of amino acids, small peptides, vitamins, and most glucose".

Also, it's not the duodenum since (if i remember correctly) only b12 and iron are absorbed there...

no clue about your 2nd question😀

good luck!

I believe vitamin b12-IF complex gets absorbed in the terminal ileum, not the duodenum. B12 gets it's protective R factor cleaved and binds to IF in the duodenum, only to travel that long road to finally be absorbed in the terminal ileum.

I believe the major source of vit K2 comes from E.Coli, which is in greatest abundance in the large intestine. Not sure about dietary K2 or K1. I'll have to look that up.

 

[phospho]

I believe the major source of vit K2 comes from E.Coli, which is in greatest abundance in the large intestine. Not sure about dietary K2 or K1. I'll have to look that up.

now that you mention that, it makes sense. I guess i just thought that since the original question mentioned "absorption", it wasn't referring to the product of E.Coli in the large intestine, but was referring to the dietary vitamin K that was actually literally being absorbed...

trying to google it, but I can't seem to come up with anything...😳

 

[Runnin Doc]

According to my Histology Notes about the Intestines, Vitamin K is reabsorbed in the Colon and is made from the E. coli that inhabit this part of the GI tract. However, the E. coli do not release the Vit. K until they die. Hope this helps!

 

[smiles323]

If I remember correctly from micronutrient nutrition last semester, the fat-soluble vitamins are primarily absorbed in the Jejunum--so, I'd say B

 

[supraman]

i'm not 100% positive, but i am pretty sure it's the jejunum:

check this wiki article out:

http://en.wikipedia.org/wiki/Jejunum

"The transport of nutrients across epithelial cells through the jejunum and ileum includes the passive transport of sugar fructose and the active transport of amino acids, small peptides, vitamins, and most glucose".

Also, it's not the duodenum since (if i remember correctly) only b12 and iron are absorbed there...

no clue about your 2nd question😀

good luck!

you're not welcome here

 

[Frederico Albin]

you're not welcome here

lol

 

[akabar]

hey guys, needed help on this question:

Vitamin k absorption occurs mainly in the:
A. Duodenum
b. Jejunum
c. Stomach
d. Large intestine
e. Mouth

it's definitely not in the mouth or stomach....i tried googling, but all it says is that it occurs in the intestine, and doesnt specify which (although i did find something that said vitamin k is synthesized in the large intestine).

Also, another question i didnt know: Organisms of which of the following phylum use "tubular feet"
a. Platyhelminthes
b. Coeloenterates
c. Echinoderms
d. Arthropods
e. Chordates

thanks ahead!

#1 b
#2 c

 

[Chesnok]

echinoderms for tubular foot (star fish)
based on basic bio course, K is absorbed in colon; histology is not required on the DAT so take the least ambiguous answer. They don't want to trick you, just check if you know LOTS of basic stuff.
GL.

 

[taptapgrind]

you're not welcome here

?????😕

 

[krazchikin]

you're not welcome here

Actually....YOU'RE not welcome here! no celtics allowed in here! lol jk...hope to see you guys in the finals again this year so we can hand you the ass whooping you deserve! haha

Back to the topic...thanks for all the responses guys, but it seems that almost half of he responses were leaning toward the L. intestine and the other half the jejunum....let's assume that the source of Vitamin K is dietary, if that'll clear it up any...

 

[phospho]

If it's dietary, I still think it's the jejunum (since most vitamins are absorbed there, particularly the fat soluble ones). If it's not dietary, then it's obviously the large intestine.

But, i'm just remembering stuff I had to know for the MCAT, not the DAT - I'm sure Pdizzle and others know much more about this.

Also, Chesnok makes a good point - always stick with the basics. I think I would say the answer is
D if they don't mention if it's dietary or not. It would really depend on whether our major source of vitamin K is dietary or nondietary, which I really don't know.

🙂