Assertion (A) : All the proteins in our food are digested in the small intestine only.

Reason (R) : The protein-digesting enzymes from the pancreas are released into the small intestine.

Correct option is D

• The stomach's pepsin enzyme initiates the process of breaking down proteins. The stomach's active enzyme for breaking down proteins is called pepsin. 

• The pancreas produces the inactive form of the protein-digesting enzyme trypsin, which is then activated in the small intestine to begin breaking down protein. 

• The first and shortest section of the small intestine is called the duodenum. 

• Trypsin hydrolyzes peptide bonds in the duodenum, dissolving proteins into smaller peptides. 

• Peptides and polypeptides are still being broken down by enzymes into amino acids.

• Because amino acids are so tiny, they can pass through the lining of the small intestine and enter the circulation.

​​