DIGESTIVE SYSTEM:-

• The digestive system consists of alimentary canal and digestive glands.
• The alimentary canal is short because frogs are carnivores and hence the length of intestine is reduced.
• The mouth opens into the buccal cavity that leads to the oesophagus through pharynx.
• Oesophagus is a short tube that opens into the stomach which in turn continues as the intestine, rectum and finally opens outside by the cloaca.

• Liver secretes bile that is stored in the gall bladder.
• Pancreas, a digestive gland produces pancreatic juice containing digestive enzymes.
• Food is captured by the bilobed tongue.
• Digestion of food takes place by the action of HCl and gastric juices secreted from the walls of the stomach.
• Partially digested food called chyme is passed from stomach to the first part of the small intestine, the duodenum.
• The duodenum receives bile from gall bladder and pancreatic juices from the pancreas through a common bile duct.
• Bile emulsifies fat and pancreatic juices digest carbohydrates and proteins.
• Final digestion takes place in the intestine.
• Digested food is absorbed by the numerous finger-like folds in the inner wall of intestine called villi and microvilli.
• The undigested solid waste moves into the rectum and passes out through cloaca.