Emulsification of fats by bile occurs in the .......

$A$: Gastrectomy causes iron deficiency anaemia.
$R$: Hydrochloric acid secreted by oxyntic cells converts ferric into ferrous and iron is absorbed as ferrous ions.

If for some reason the parietal cells of the gut epithelium become partially non-functional,what is likely to happen?

Bacteria present in contaminated food reaching the stomach are destroyed by:

Which one of the following results in the production of indole and skatole?

Which $pH$ value is optimal for the action of enzymes on food in the stomach?