Describe the digestive system of a frog with a diagram.

(N/A) The digestive system of a frog consists of an alimentary canal and digestive glands.
The alimentary canal is short because frogs are carnivores,and hence the length of the intestine is reduced.
The mouth opens into the buccal cavity,which leads to the oesophagus through the pharynx. The oesophagus is a short tube due to the absence of a neck. The oesophagus opens into the stomach.
Stomach: It is located on the left side in the body cavity. It is long,broad,and slightly curved. It is made up of two parts. The anterior larger part is called the cardiac stomach,and the posterior narrow part is called the pyloric stomach.
The pyloric end of the stomach is constricted,and its opening into the small intestine is guarded by a sphincter (a circular ring-like muscle).
The small intestine is divided into the duodenum and the ileum.
The duodenum curves upwards to form a '$U$' shape with the stomach.
Liver and Pancreas are accessory digestive glands. The liver produces bile juice,which is stored in the gallbladder. The pancreas is a digestive gland that secretes pancreatic juice containing 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 the pancreas and opens into the duodenum.
Ileum: It is the longest and coiled part of the alimentary canal. Digestion and absorption of digested food occur in the small intestine.
Large Intestine: The ileum opens into the large intestine. The anterior rectum is a short,broad tube. It goes further and opens into the cloaca.
Cloaca: It is a small,sac-like structure that receives the openings of the anus and the urinogenital apertures.
The cloaca opens to the exterior through a cloacal aperture situated at the posterior end of the body.
Digestion process in a frog:
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 is called chyme.
Chyme is passed from the stomach to the first part of the intestine,the duodenum.
The duodenum receives bile from the gallbladder 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.
Absorption: Digested food is absorbed by numerous finger-like folds in the inner wall of the intestine called villi and microvilli.
The undigested solid waste moves into the rectum and passes out through the cloaca.