Which word best describes the action of bile on fats?

Protein $\rightarrow$ $\dots\dots$

Two friends are eating at a dining table. One of them suddenly starts coughing while swallowing food. This coughing is likely due to the improper movement of which of the following?

Acid secretion in the stomach is stimulated by

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

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