Protein digestion begins in the stomach under the influence of pepsinogen, continues in the duodenal lumen under the influence of pancreatic proteolytic enzymes, and is completed intracellularly in the small intestinal brush border.

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This is a correct statement about protein digestion. Pepsinogen is converted to active pepsin in the acidic environment of the stomach and breaks down proteins into smaller peptide fragments. Pancreatic proteolytic enzymes, including trypsin, chymotrypsin, and carboxypeptidase, further break down these peptides in the duodenum. The final step of protein digestion occurs in the brush border of the small intestine, where peptidases on the surface of enterocytes hydrolyze peptides into amino acids that can be absorbed into the bloodstream.

Protein Digestion Begins in the Stomach Under the Influence of Pepsinogen