Protein digestion begins in the stomach of the human alimentary canal and is completed in the small intestine. Describe in detail how enzymes function to digest protein in the alimentary canal.

1 enzymes are, biological / protein, catalysts / speed up reactions; 2 ref to specificity; 3 active site; 4 substrate/ protein, fits into /AW, enzyme / active site; 5 ref to, complementary shape of molecules; 6 enzyme-substrate complex /ESC; 7 enzymes, lower energy needed for reaction; 8 enzymes are, unchanged (at end of reaction)/reused; 9 (enzymes) carry out, chemical digestion / hydrolysis / catabolic reactions; 10 break down, large /insoluble, molecules into, small(er)/ soluble, molecules; 11 protein broken down to, polypeptides /peptides /amino acids; 12 pepsin, active in stomach; 13 trypsin, active in, small intestine /duodenum / ileum; ref. to conditions in alimentary canal 14 low pH/ pH 1–3 /(hydrochloric) acid, in stomach; 15 high pH/ alkaline /neutral / non-acidic / pH 7–9, in, small intestine / duodenum / ileum; 16 ref. to denaturation; 17 temperature is 37 °C; 18 ref. to successful collisions;