Answer:
Intrinsic factor secreted by parietal cells of stomach influences the absorbtion of vitamin B12.
Step-by-step explanation:
Vitamin B 12 is absorbed in the most distal part of small intestine (ileum) . For its absorbtion it combines with a glycoprotien called intrinsic factor in the stomach.
As vitamin B12 is injected intramuscularly , it enters blood stream and ultimately it is taken to the stomach.
Absorbtion of vitamin B12 is a 2 step process.
1) Hydrochloric acid in the stomach separates vitamin B 12 from the protien to which vitamin B12 is attached to food.
2)After the release of vitamin B12 , it combines with the glycoprotien (intrinsic factor) made bt stomach and then it is absorbed by the body.