There is no protein digestion in oral cavity as there are no proteases present.
Stomach:
The proenzyme pepsinogen, on exposure to hydrochloric acid gets converted to active enzyme pepsin. Which converts proteins into proteoses and peptones.
Intestine:
Pancreatic juice contains inactive enzymes like trypsinogen, chymotrypsinogen and procarboxy peptidases. Trypsinogen is converted to active trypsin with the help of enzyme enterokinase. Trypsin, in turn, activates other proteolytic enzymes in the pancreatic juice. Proteins, proteoses and peptones in the intestine are now converted to dipeptides in presence of trypsin, chymotrypsin and carboxypeptidase.
The aminopeptidase hydrolyses the peptide bond that attaches the terminal amino acid to the amino end of the peptide. Dipeptidase acts on dipeptides and convert them to amino acids.
Amino acids are the end products of protein digestion.
