Describe digestive system of frog with diagram.

Explanation

The digestive system of frog 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 due to absence of neck. Oesophagus opens into stomach. Stomach : It is located on the left side in the body cavity. It is long, broad and slightly curved as cavity. It is made up of two parts. The anterior larger part is called cardiac stomach and the posterior narrow part is called pyloric stomach. The pyloric end of stomach is constricted and its opening into small intestine is guarded by a sphincters, (a circular ring like muscule) Small intestine is divided into duodenum and illeum. Duodenum curves upwards to form a ‘U’ with the stomach. Liver and Pancreas are accessory digestive glands. Liver produces bile juice. It is stored in gallbladder. Pancreas is a digestive gland. It secretes pancreatic juice that possesses digestive enzymes. Liver and Pancreas : Bile juice and pancreatic juice. The hepatic duct and cystic ducts join to form a common bile duct which runs through pancreas and opens into the duodenum.Ileum : It is the longest and coiled part of alimentary canal. Digestion and absorption of digested food occurs in small intestine. Large Intestine : Ileum opens into large intestine. Anterior rectum is a short broad tube. It goes further and opens into cloaca. Cloaca : It is a small saclike structure and receives the openings of anus and urine genital apertures. Cloaca opens towards the exterior through ventor cloacal opening situated at the posterior end of the body. Digestion process in frog : Food is captured by the bilobed tongue. Digestion of food takes place by the action of HC1 and gastric juices secreted from the walls of the stomach. Partially digested food is called chyme. Chyme is passed from stomach to the first part of the intestine, the duodenum. The duodenum receives the bile from gall bladder and pancreatic juices from the pancreas through a common bile duct. Bile emulsifies fat and panecreatic juices digest carbohydrates and proteins. Final digestion takes place in intestine. Absorption : Digested food is absorbed by the numerous finger like folds in the inner wall of intestine called villi and micro villi. The undigested solid waste moves into the rectum and passes out through cloaca.