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rbc 1 megaloblastic anemia (transport (food (protein (protein-B12)),…
rbc 1 megaloblastic anemia
vitamin B9 folate
methotrexate
phenytoin
bacteria
dark leafy greens
liver
blood
albumin
absorption
duodenum, jejunum
transport
food
protein
protein-B12
salivary glands
R-protein, transcobalamin I, haptocorrin
R-B12
parietal cell
intrinsic factor
IF-B12
blood
70% transcobalamin I
x enter cell
30% transcobalamin II
v enter cell
absorption
distal ileum (IF-B12)
vitamin B12 cobalamin
mouth
vegetarian
stomach
gastrectomy, radiotherapy
pernicious anemia (anti-parietal cell, anti-intrinsic factor)
distal ileum
ileectomy, radiotherapy
inflammatory bowel disease
bacteria
animal products
e.g. liver