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1497 Physiology

False regarding physiology of cobalamin absorption and metabolism

ACobalamin undergoes enterohepatic circulation in humans
BAfter cobalamin-intrinsic factor complex enters the ileal cell, cobalamin appears in portal circulation after a delay of about 6 hours.
CAbsorption of cobalamin occurs by active process in ileum only
DAdocobalamin is cofactor for methylmalonyl coA mutase and methylcobalamin is a co factor for methionine synthase
Physiology
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