Pancreatic juice

Pancreatic juice is a liquid secreted by the pancreas, which contains a variety of enzymes, including trypsinogen, chymotrypsinogen, elastase, carboxypeptidase, pancreatic lipase, nucleases, and amylase. These enzymes play a crucial role in digestion by breaking down food particles in the duodenum (the first part of the small intestine).

Composition

Pancreatic juice is composed of two secretory products critical to proper digestion: digestive enzymes and bicarbonate. The enzymes are synthesized and secreted from the exocrine acinar cells, while bicarbonate is secreted from the epithelial cells lining small pancreatic ducts.

Digestive Enzymes

The digestive enzymes are secreted in an inactive form known as zymogens or proenzymes. The major enzymes include:

• Trypsinogen: This is activated in the duodenum into trypsin by the enzyme enterokinase, which is embedded in the intestinal mucosa. Once activated, trypsin can activate more trypsinogen, as well as chymotrypsinogen and procarboxypeptidases.

• Chymotrypsinogen: This is activated by trypsin into chymotrypsin.

• Procarboxypeptidases: These are activated by trypsin to produce carboxypeptidase A and B.

• Pancreatic lipase: This breaks down triglycerides into monoglycerides and free fatty acids.

• Pancreatic amylase: This breaks down large polysaccharides (starch and glycogen) into smaller sugars.

• Ribonuclease and deoxyribonuclease: These break down nucleic acids into nucleotides and nucleosides.

Bicarbonate

Bicarbonate is a base and critical to neutralizing the acid coming into the duodenum from the stomach. The bicarbonate also creates a slightly alkaline environment in the duodenum, allowing the enzymes to function optimally.

Clinical significance

Abnormalities or blockage of the pancreatic juice can lead to several health problems, including pancreatitis, cystic fibrosis, and pancreatic cancer.

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