A 62-year-old man complains of fatigue, progressive weakness and numbness of his arms and legs. Complete blood count shows decreased numbers of erythrocytes and increase in the mean cell volume.
Removal of which of these structures requires lifelong administration of the vitamin involved in this case?
This is a case of megaloblastic anemia due to vitamin B12 deficiency. Vitamin B12 is absorbed in the ileum after combining with intrinsic factor secreted in the stomach. Removal of the stomach or the ileum results in lifelong administration of vitamin B12 to protect the patient against megaloblastic anemia.
The correct answer is C