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Protein digestion starts in the stomach with the action of enzyme pepsin. In the duodenum it is performed by the action of trypsin, chymotrypsin & carboxypeptidases (from pancreatic juice). Aminopeptidases & dipeptidases, enterokinase act in jejunum and it ends in the ileum.

1. Protein digestion starts in the stomach and ends in the jejunum.
2. Protein digestion starts in the stomach and ends in the ileum.
3. Protein digestion starts in the duodenum and ends in the jejunum.
4. Protein digestion starts in the duodenum and ends in the ileum.

Correct answer: Protein digestion starts in the stomach and ends in the ileum.

Solution

Protein digestion begins in the stomach with pepsin. It continues through the duodenum and jejunum, and is completed in the ileum, so the correct statement matches that full pathway.

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