Pancreatic Juice Secretion

Pancreatic juice is a fluid secreted by the pancreas that aids in the digestion of food in the small intestine. It is composed of water, electrolytes, and enzymes that break down carbohydrates, proteins, and fats.

Stimuli for Pancreatic Juice Secretion

Pancreatic juice secretion is stimulated by three hormones: secretin, cholecystokinin (CCK), and pancreozymin. These hormones are released by the duodenum in response to the presence of food.

Function of Secretin

Secretin is released by the duodenum in response to the acidic chyme (partially digested food) entering from the stomach. It stimulates the pancreas to secrete a watery, bicarbonate-rich solution that neutralizes the acidic chyme. Secretin also inhibits gastric acid secretion from the stomach, slowing down the digestion process.

Function of Cholecystokinin (CCK)

Cholecystokinin (CCK) is released by the duodenum in response to the presence of fatty acids and amino acids in the chyme. It stimulates the pancreas to secrete pancreatic enzymes that break down proteins and fats in the chyme. CCK also stimulates the gallbladder to release bile, which emulsifies fats, making them easier to digest.

Function of Pancreozymin

Pancreozymin is released by the duodenum in response to the presence of fatty acids and amino acids in the chyme. It stimulates the pancreas to secrete enzymes that break down proteins and fats in the chyme.

Conclusion

Pancreatic juice secretion is stimulated by three hormones: secretin, cholecystokinin (CCK), and pancreozymin. Secretin stimulates the pancreas to secrete a watery, bicarbonate-rich solution that neutralizes the acidic chyme, while CCK and pancreozymin stimulate the pancreas to secrete enzymes that break down proteins and fats in the chyme.

Secretin...