from Guyton and Hall textbook of medical physiology, 4th South Asia edition write a 2 mark short answer Describe the Composition and function of pancreatic juice.
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I now have all the content needed from Guyton and Hall. Here is the 2-mark short answer:
Composition and Function of Pancreatic Juice
(Guyton and Hall Textbook of Medical Physiology, p. 805-806)
Pancreatic juice is a combined secretion of the pancreatic acini and ductal epithelium. It contains two major components:
1. Digestive Enzymes (secreted by pancreatic acini):
- Proteolytic enzymes - trypsin, chymotrypsin, and carboxypeptidase. They are secreted in inactive forms (trypsinogen, chymotrypsinogen, procarboxypeptidase) and activated in the intestine. They digest proteins and peptides into smaller peptides and amino acids.
- Pancreatic amylase - hydrolyzes starches, glycogen, and most other carbohydrates (except cellulose) into disaccharides and trisaccharides.
- Lipases - pancreatic lipase (hydrolyzes neutral fat into fatty acids and monoglycerides), cholesterol esterase (hydrolyzes cholesterol esters), and phospholipase (splits fatty acids from phospholipids).
2. Sodium Bicarbonate (HCO3-) (secreted by ductal epithelium):
- Secreted in large quantities; concentration can rise up to 145 mEq/L (about five times that of plasma HCO3-).
- Its primary function is to neutralize the acidic chyme entering the duodenum from the stomach, creating an appropriate pH for intestinal enzymatic digestion.
In summary, pancreatic juice digests all three major food types - proteins, carbohydrates, and fats - while its alkaline bicarbonate component protects the duodenal mucosa by neutralizing gastric acid.
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