$................$ emulsifies fats.

How is the intestinal mucosa protected from the acidic food entering from the stomach?

Which one of the following equations correctly matches the action of enzymes on the given substrate and the end product of the reaction?

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

Which word best describes the action of bile on fats?

Pepsinogen (inactive form) is converted into the active form of the enzyme pepsin with the help of which of the following compounds?