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BIOCHEM 102 > L4 : Vitamin D and E > Flashcards

L4 : Vitamin D and E Flashcards

1
Q

WHAT VITAMIN IS A GROUP OF STEROLS WITH HORMONE LIKE ACTION ?

A

vitamin D

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2
Q

how is vitamin D activated ?

A

25- hydroxylation in the liver and then 1 alpha-hydroxylation in kidney to produce the active form which is 1, 25 dihydroxycholecalciferol (calcitriol)

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3
Q

what is the main metabolic role of vitamin D ?

A

Maintains adequate plasma levels of calcium by acting on intestinal mucosal cells , distal kidney tubes and bone

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4
Q

what is vitamin D deficiency in adults called ?

A

osteomalcia

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5
Q

what vitamin is a mixture of 8 naturally occurring tocopherols? and which of these proteins is the most abundant
?

A

vitamin E, Alpha tocopherol

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6
Q

what is the role of vitamin E ?

A

inactivate the reactive oxygen species . it is the major lipid soluble anti-oxidant in cell membranes and lipoproteins

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7
Q

why do vitamin E deficiencies occur ?

A

They occur due to abnormalities in membrane metabolism and integrity.

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BIOCHEM 102 (6 decks)

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