Digestion of Food in Frog

Digestion of Food in Frog

In stomach: The actual digestion begin from stomach where food remain for 2 to 3 hrs. Here, food get mixed with pepsinogen and H.C.L produced by gastrice gland and oxyntic gland respectively. The inactive pepsinogen changes into active pepsin in presence of hydrochloric acid and pepsin acts upon protein to cover into peptones and proteases. Hydrochloric acid provides acidic medium and kills bacteria and fungi. Hcl also makes food soft. The the muscular contraction of wall of stomach help in mixing of digestive enzymes with done and converts done in semi solid paste like form called as chyme. The chyme passes to duodenum from pyloric valves.

In intestine: In small intestine three substances, bile, pancreatic juice and intestinal juice mixed up with food.
Bile is alkaline fluid produced by liver which neutralizes acidic food, emulsifies fat and activates pancreatic lipase. 
The pancreatic juice contains different enzymes which acts in alkaline medium. It contains trypsinogen, amylase and lipase. The inactive trypsinogen changes into active trypsin by internal enterokinase. The trypsin acts upon protein, proteoses, peptones etc. And converts them into aminoacids. The amylase converts carbohydrate into gulcose. The lipase converts emulsified fat into fatty acids and glycerol. 
The intestinal juice of succus entericus contains different enzymes besides enterokinase and acts upon all types of foods. tripsin acts upon protein and converts it into aminoacids. Maltase converts maltose into gulcose. Sucrase converts sucrose to gulcose. Lipase converts fat into fatty acids and glycerol.
Simple form of food materials are absorbed by goods lining of intestine. Presence of folds like villi make the profess of absorption faster. Gulcose and amino acids pass into alone capillaries of folds. While fatty acids and glycerol pass into lymphatic vessels or lacteal in folds.

Undigested food pass into rectum for storage and preparation re faeces. The faecal matter pass into cloaca and pass out through cloacal aperture. The passing out of feacal matter through cloacal aperture is called as egestion.