Draw a neat diagram of digestive system of frog.

The digestive system of frog consists of the alimentary canal together with associated digestive glands

The alimentary canal is a complete tube extending from the mouth to the cloaca and serves for ingestion mastication digestion absorption and egestion

Mouth forms a wide opening between immovable lips with a fixed upper jaw and a flexible lower jaw that facilitates prey capture

Buccal cavity lies immediately behind the mouth is large shallow and lined by ciliated columnar epithelium with mucous glands that lubricate food in the absence of salivary glands

• Homodont acrodont teeth occur on the premaxillae and maxillae and backward-pointed vomerine teeth hold prey without chewing
• Tongue is large muscular sticky and bifid at the free end attached anteriorly to the lower jaw and can be rapidly protruded to catch prey

Pharynx is a short continuation of the buccal cavity featuring a glottis leading to the respiratory tract and a gullet opening into the esophagus

Esophagus is a short wide muscular tube with longitudinal mucosal folds and mucous glands that allow distension and lubrication and secrete an alkaline mucus

Stomach lies on the left side of the body cavity is a slightly curved bag with cardiac and pyloric regions lined with gastric glands secreting pepsinogen and oxyntic cells secreting hydrochloric acid and is guarded at its exit by a circular pyloric sphincter

Small intestine comprises a short duodenum and a longer ileum is attached by mesenteries and lined with goblet cells and absorptive cells receives bile from the liver and pancreatic juice from the pancreas via the hepatopancreatic duct and is the principal site of chemical digestion and nutrient absorption

Large intestine is a short wide tube of low longitudinal folds that reabsorbs water stores faeces and opens into the cloaca under the control of an anal sphincter

Cloaca is a terminal sac-like chamber receiving digestive urinary and genital products and leads to the exterior through the cloacal aperture

Liver is the largest digestive gland is trilobed and reddish brown secretes bile a greenish alkaline fluid that emulsifies fats and stores it in the gall bladder before delivering it to the duodenum

Pancreas is a branched yellow gland in the mesentery between stomach and duodenum has exocrine acini that secrete pancreatic juice containing enzymes for proteins carbohydrates and lipids and endocrine islets that regulate sugar metabolism