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Why Is Bicarbonate Released into Duodenum?
Why Is Bicarbonate Released into Duodenum?
Robert Thorne••6 min read
Secretin
Secretin
Structure. Secretin is initially synthesized as a 120 amino acid precursor protein known as prosecretin. This precursor contains an N-terminal signal peptide, spacer, secretin itself (residues 28–54), and a 72-amino acid C-terminal peptide.
neutralizes the pH in the duodenum by optimizing the functionality of pancreatic amylase and pancreatic lipase. (1) Via the second messenger action of cAMP, bicarbonate release causes neutralization of the acidic environment, thus establishing a pH favorable for the action of digestive enzymes.
Why is bicarbonate secreted into the duodenum?
The duodenal lumen is exposed to aggressive factors with a high potential to cause damage to the mucosa. Bicarbonate secretion by the duodenal mucosa is accepted as the primary important defense mechanism against the hydrochloric acid intermit- tently expelled from the stomach.
What releases bicarbonate into the duodenum?
The pancreas produces pancreatic juice, which contains digestive enzymes and bicarbonate ions, and delivers it to the duodenum.
