<prompt> What is function of Intrinsic Factor?Increases cobalamin absorptionIncreases folate absorptionConves prothrombin to thrombinConve s fibrinogen to fibrin  <response>: Vit B12 synonyms are cobalamine, extrinsic factor of castle, anti-pernicious anaemia factor parietal cells of the stomach secrete a special protein called intrinsic factor IF. IF is required for the absorption of Vit B12 one molecule of IF can combine with 2 molecules of B12 this complex attaches to specific receptors on mucosal cells and get internalised ref DM Vasudevan 8thed page 477 