What does intrinsic factor do in the digestive system?

Intrinsic factor is a glycoprotein produced by the parietal cells of the stomach lining. Its primary function is to facilitate the absorption of vitamin B12 in the intestines. Vitamin B12, also known as cobalamin, is essential for red blood cell formation, neurological function, and DNA synthesis. Without intrinsic factor, the body cannot properly absorb vitamin B12, leading to deficiencies that can cause anemia and neurological issues.

The other functions listed do not pertain to intrinsic factor. For example, breaking down carbohydrates is mainly the role of enzymes like amylase found in saliva and pancreatic secretions, while appetite regulation involves hormones and neuronal signals that are distinct from the function of intrinsic factor. Additionally, the neutralization of stomach acid primarily occurs through bicarbonate secretion from the pancreas, not through intrinsic factor.