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Protein digestion occurs mainly in the stomach and also in the small intestine.

When protein food is eaten and enters the stomach, the hydrochloric acid in the stomach "denatures" the protein. This means it starts to break the protein down into short chains of amino acids joined together (peptide chains).

This is also when the the hydrochloric acid (HCl) also activates an enzyme called pepsin to participate in the break-down of the protein.

After this, the broken down protein enters into the small intestine where it is further broken down into the di-peptides (2 amino acids joined together) by pancreatic enzymes and then into its individual amino acids by other pancreatic enzymes.

The amino acids are absorbed through the small intestine and travel in the blood stream into the liver.

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14y ago

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