high power of regeneration and liver cells are replaced by new ones every - weeks. Apart from bile secretion, the liver also performs several functions . Destroys aging and defective blood cells Figure . Salivary Glands Though the bile juice of liver has no digestive enzyme but is very essential for proper digestion of food, especially of the fats.
Discuss the following? a) What is composition of bile? b) How it helps in digestion of fats and other nutrients of food? c) How it helps in absorption of fats?
Jejunum Falciform ligament Right lobe of liver Left lobe of liver Diaphragm Right and Left hepatic duct of liver Common hepatic duct Common bile duct Pancreas Pancreatic duct (duct of Wirsung) Gallbladder Cystic duct Duodenum Hepatopancreatic duct (Ampulla of vater) Accessory pancreatic duct Sphincter of Oddi Figure . Liver and Pancreas XI Std Biology-Zoology Chapter- agent mucus (a glycoprotein). The mucus in saliva prepares the food for swallowing by moistening, softening, lubricating and adhering the masticated food into a bolus. About percent of polysaccharide, starch is hydrolyzed by the salivary amylase enzyme into disaccharides (maltose).
The bolus is then passed into the pharynx and then into the oesophagus by swallowing or deglutition . The bolus further passes down through the oesophagus to the stomach by successive waves of muscular contraction called peristalsis . The gastro oesphageal sphincter controls the passage of food into the stomach. Digestion in the Stomach Food remains in the stomach for to hours, the rhythmic peristaltic movement churns and mixes the food with gastric juice and make it into a creamy liquid called chyme .
The gastric secretion is partly controlled by autonomic reflexes. The secretion of gastric juice begins when the food is in the mouth. The gastric juice contains HCl and proenzymes. The proenzyme pepsinogen, on exposure to HCl gets converted into the active enzyme pepsin which converts proteins into proteoses and peptones (peptides).
The HCl provides an acidic medium which is optimum for pepsin, kills bacteria and other harmful organisms and avoids putrifaction. The mucus and