Vitamins A, D, E, K
Biochemistry
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Integration of Metabolism
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Nutritional Deficiencies
Q. A 56-year-old man with atrial fibrillation is started on warfarin. After several weeks, his INR is markedly elevated. Which of the following best explains the mechanism of action of this drug?
a
Inhibits conversion of 7-dehydrocholesterol to cholecalciferol
b
Inhibits renal 1-alpha hydroxylase
c
Blocks reduction of vitamin K epoxide to vitamin K hydroquinone
d
Scavenges free radicals to protect RBC membranes
e
Blocks retinal photopigment regeneration
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