2 published verifications about Duodenum Duodenum ×
“Pancreatic proteases such as trypsinogen and chymotrypsinogen are synthesized as inactive zymogens and are activated in the duodenum by an intestinal enzyme (enterokinase/enteropeptidase), which helps prevent autodigestion of the pancreas.”
The claim matches standard human physiology. Pancreatic proteases are secreted as inactive precursors, and enteropeptidase in the duodenum initiates their activation by converting trypsinogen to trypsin, which then activates other zymogens. Delaying activation until the intestine is an important safeguard against pancreatic autodigestion, though not the only one.
“After proteases finish digesting food in the duodenum, they move with chyme into the middle and distal small intestine and then digest themselves and other enzymes into amino acids.”
Reliable physiology sources show that pancreatic proteases do travel through the small intestine and are progressively inactivated and degraded there. But the claim misstates the sequence and emphasis: protein digestion does not simply end in the duodenum, and distal enzyme breakdown is not shown to be the main or intended next step. It blends a real phenomenon with an overstated physiological narrative.