absorption vand-opløselige Flashcards

1
Q

Thiamin absorption 3 skridt?

A

Thiamin phosphates bliver hydrolyseret
Aktiv transport i tarmen ind i intestinal cells
transporter system i lav koncentration regulere optaget
aktiv transport fra intestinal cell ind i blodet: bindes til albumin

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2
Q

inhibering af thiamin absorbtion

A

alkohol: transport proteinet fra celle ud i blodet

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3
Q

absorption af riboflavin fra mad eller microbiota?

A

hydrolyse til frit riboflavin
natrium afhængig absorption (mad)
carrier mediated system (bakterier)

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4
Q

absorption af niacin?

A

hydrolyse
natrium afhængig absorption i tyndtarm
natrium uafhængig i tyk tarmen

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5
Q

absorption af pyridoxal phosphate?

A

hydrolyse

carrier-mediated diffusion

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6
Q

absorption af folate i mad eller bakterier?

A

hydrolyse(i mad)
absorption i tyndtarmen
carrier-mediated (bakterier)

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7
Q

B12 absorbtion mund til tarm(step 1 ud af 4)?

A

lav diffusion
i maven:
B12 bundet til cobalophilin(findes i spyt)

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8
Q

B12 absorbtion tarm til intestinal celler(step 2 ud af 4)?

A

i tarmen:
B12-cobalophilin hydrolyseres af gastrisk syrer eller pepsin
IF binder til B12 absorberet gennem receptor-medieret endocytosis

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9
Q

B12 absorbtion intestinal celler til blod (step 3 ud af 4)?

A

i enterocytes:

proteolysis og binding af transcobolamin II (transcobolamin I måske)

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10
Q

B12 absorbtion blod til væv(step 4 ud af 4)?

A

i væv:
receptor-medieret endocytosis optag af holo-transcobolamin II
proteolysis af kompleks

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11
Q

ascorbate absorption?(2 veje)

A

ascorbate: aktiv transport (tarm), natrium dependent transporters(blod).
dehydroascorbate: carrier-mediated (tarm), insulin-dependent glucose-transporter (blod)

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