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A3 megaloblastic (vit b9: folate (dark leafy greens (liver), bacteria),…
A3 megaloblastic
vit b9: folate
dark leafy greens (liver)
bacteria
blood
70% transcobalamin i
x enter cell
30% transcobalamin ii
v enter cell (active b12)
vit b12: cobalamin
animal products (liver)
bacteria
absorption
duodenum, jejunum
blood
albumin
absorption
IF-B12 complex
distal ileum
protein, transcobalamin i, intrinsic factor (parietal cell)