![]() Duodenum curves upwards to form a ‘U’ with the 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. The anterior larger part is called cardiac stomach and the posterior narrow part is called pyloric stomach. It is long, broad and slightly curved as cavity. Stomach : It is located on the left side in the body cavity. Oesophagus is a short tube due to absence of neck. The mouth opens into the buccal cavity that leads to the oesophagus through pharynx. The alimentary canal is short because frogs are carnivores and hence the length of intestine is reduced. The undigested food (called faeces) are excreted out by cloacal aperture which is called egestion.Solution The digestive system of frog consists of alimentary canal and digestive glands. Finally, the digested food is distributed by the blood to different tissue and cells which takes part in metabolic reactions to release energy. The amino acids, glucose, fructose are absorbed at the top and bottom of villi whereas fatty acid and glycerol are absorbed in lymph vessels called lacteals. The villi increase the absorptive surface area. It contains several enzymes such as enterokinase, erepsin, maltase, lipase, sucraseĪbsorption, Assimilation and Egestion of foodĪll the digested food materials are absorbed mainly in duodenum and ileum due to the presence of villi. The juice of ileum is succus entericus secreted by intestinal glands. These enzymes act best in an alkaline medium and hydrolyze the food. Pancreatic juice: It consists of three enzymes such as trypsinogen, amylase and lipase. It also provides alkaline medium necessary for the action of the enzymes present in the pancreatic and intestinal juice. It helps in emulsification of fats and breaks them into fine droplets. It has no chemical action on food but it helps in neutralizing the acidic food. Also, cholecystokinin diffuses into blood circulation and reaches gall bladder to contract and pour bile into duodenum through hepatopancreatic duct.īile: It is an alkaline fluid which is secreted by liver. Secretin stimulates the pancreas to secrete pancreatic juice. The acidified chyme stimulates the mucosa of duodenum to secrete the hormone secretin and cholecystokinin. In duodenum, the food is acted upon by the combined action of bile and pancreatic juice and intestinal juice. The chyme enters the duodenum through the pyloric valve. The food remains for about 2-3 hours in stomach and the digested food is absorbed while the remaining food is passed into duodenum. The partial digested food is converted into semi-solid state called as chyme which is acidic. The carbohydrates and fats remain unaffected by pepsin. Pepsinogen (inactive) + HCL Pepsin (active) Pepsin hydrolyze the protein content of food into soluble peptones and proteases. Pepsinogen changes into active form pepsin in acidic medium. It activates the enzymes (converts inactive pepsinogen into active pepsin). ![]() ![]() It provides acidic medium which is necessary for the action of pepsin.The gastrin also regulates the secretion of HCL which is produced from oxyntic cell. The presence of food in stomach produce gastrin hormone which stimulates the gastric gland to secrete gastric juice. The digestion start in stomach firstly breaking down into small pieces by muscular action and then by gastric juice. The food lowers down with the help of peristalsis. The mucus of the wall of oesophagus helps to lubricate and moisten the food. Hence, no enzymatic digestion takes place in buccal cavity. The process of breaking down of complex food into simple soluble and diffusible form with the help of their respective enzymes are called digestion.īucco-pharyngeal cavity does not secrete any enzymes. The movement by which the food passes in the oesophagus and the rest of the alimentary canal. During ingestion, mouth is opened and the tongue is released out to catch the prey which is then rapidly withdrawn into the buccal cavity and mouth is closed. The food is captured with the help of sticky tongue. The process of taking of food into alimentary canal through mouth is called ingestion. However, the tadpoles are herbivorous: feeding on aquatic plants. The adult frog is carnivoruous which feeds upon small insects, worms, snails etc. Please Rate 0 1 2 3 4 5 PHYSIOLOGY OF DIGESTION IN FROG Food and feeding ![]()
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