It is a short slit in the floor of the pharynx. It is separated by the palate and functions as an entrance to the digestive system and is composed of the … 12 13 14. Related Questions. Let's study various digestive system function and … (ii) These glands differ in their structure at different regions of the stomach. 1. Its mode of catching of its prey is remarkable. It regulates the passage of food from the stomach into the intestine. Describe the structure and functions of cavity of frog with well-labelled diagram. How about ''canine''? This preview shows page 7 - 11 out of 11 pages.. Buccal respiration is there in frog when it is on land. A) Structure present on the upper jaw: The upper jaws of frog are fixed or immovable. The excess amino acids instead of being stored are converted into ammonia by liver, which combines with carbon dioxide and is changed into urea and other nitrogenous wastes by the action of enzymes (deamination) which are finally eliminated as urine by the kidneys. The frog closes its glottis and mouth while drawing air into the lungs. TOS4. It also produces heparin which prevents clotting of blood in blood vessels. The liver receives blood from the hepatic artery and the hepatic portal vein. 5. The esophagus’s glandular lining secretes an alkaline digestive fluid. The wide mouth opens into the buccal cavity. Bile has no digestive purpose; it only emulsifies fats for proper digestion. These alveoli unite with each other through their ductules, which in turn unite to form the larger ducts and then finally form the pancreatic ducts. into the buccal cavity, Although some­ times listed as a characteristic defining the class, it is only among certain salamanders and frogs that the tongue appears to be flipped out rather than moved by incre­ mental control. Muscularis mucosae is thin. A) Structure present on the upper jaw: The upper jaws of frog are fixed or immovable. The esophagus is the food pipe that traverses from pharynx to the stomach of the alimentary canal. And these vocal sacs act as resonators during croaking or to call upon their mate for mating. On the floor of the buccal cavity lies a large muscular sticky tongue. It is also a watery alkaline fluid containing three powerful to liver enzymes called trypsinogen, amylopsin (amylase) and steapsin (lipase), all of which act in an alkaline medium and hydrolyse all the three types of food substances. It is a short, wide, muscular and highly distensible tube that has a mucous epithelial lining that contains some mucous glands. Figure 6.1 Draw the external anatomy Note of the following labels for each structure identified 1. axial region 2. appendicular region 3. snout 4. external nares 5. mouth 6. eyes 7. upper eyelid 8. lower eyelid 9. nictitating membrane 10. brow spot 11. tympanic membrane 12. trunk 13. hump 14. cloaca 15. forelimb Draw (iii) Lipase and maltase along with the same enzyme of the pancreatic juice act on emulsified fats and maltose and convert them into fatty acids and sugars respectively. Function of buccal cavity of the frog? Recent researches show that it is not necessary for all fats to be changed into glycerol and fatty acids for absorption, it is seen that fat droplets come in contact with villi and pass through their cell wall by pinocytosis into small lymphatic vessels. From the buccal cavity the prey is directly pushed into oesophagus where it undergoes physical changes due to constant peristaltic movement of its wall. During swallowing of food, eyes are depressed into the buccal cavity which pushes the food into the pharynx. True villi, crypts are lacking. On the floor of the buccal cavity lies a large, protrusible muscular sticky tongue. Cloaca lies in the hind of the body. The alimentary canal of the frog is complete. In the roof of the pharynx on either lateral side is present a wide eustachean opening which communicates with the middle ear. The air enters into the cavity through external nares and gaseous exchange takes place through the lining of the buccal cavity between blood and oxygen (air) present in the cavity by the diffusion process. During development, gills disappear and lungs develop and the tadpole metamorphoses into an adult frog. Buccal cavity of frog:Mouth leads into the buccal cavity and it is a wide space between upper and lower halves of the head. The body of the frog may be divided into: Axial Region: Head Trunk Appendicular Region: Two pairs of Appendages Forelimbs Hindlimbs 2. They are elongated tubular structures set very closely together, and frequently more or less branched, called gastric glands. Large surface area. Frogs display three basic types of vocal sacs: a single median throat sac, paired throat sacs, and paired lateral sacs. The teeth nature in the frog is homodont (similar), acrodont (not having teeth socket). External nares are opened followed by raising the buccal floor, pushing the air out through external nares. The longitudinal foldings of the esophagus allow its expansion during the passage of food into the stomach. The stomach’s mucous epithelium secretes an enzyme called pepsinogen, and unicellular oxyntic glands secrete hydrochloric acid. It kills bacteria and also eliminates foreign substances from the blood. In the alimentary canal the processes of mastication, digestion and absorption take place, while the digestive glands secrete certain enzymes which bring about the digestion of the ingested food. Buccal cavity. The food gets absorbed, digested, assimilated and egested during this journey. The free edge is forked. It is the most important part of the alimentary canal where the digestion of ingested food takes place with the help of certain digestive enzymes secreted by the digestive glands situated in its wall. The hepatic and crystic ducts join to form a common bile duct which runs through the pancreas and opens into the duodenum. Mucus lubricates the food. 9. It has some goblet cells which produce mucus making the food material slippery. Asked by Wiki User. The buccal cavity, otherwise known as the mouth, marks the beginning of the digestive system. Ask your question. Frog also can have gas exchange through the buccal cavity that consists of moist mucus membrane and richly supplied blood vessels.The air enters the cavity through nares and gaseous exchange takes place through the lining of the buccal cavity between blood and air present in the cavity. The pepsin of stomach along with pepsin of oesophagus acts on proteins of food and changes them into peptones and proteoses. The metabolic waste like CO2 is eliminated from the body. The frog has three respiratory surfaces on its body that it uses to exchange gas with the surroundings: the skin, in the lungs and on the lining of the mouth. Log in. It is composed of outer longitudinal and inner circular smooth muscle fibres which are in spirals. Water, mineral salts and other nutrients are directly absorbed through the mucosa. The glycerol and fatty acids pass into lymph vessels called lacteals. Neither taste buds nor mucous glands produce any digestive enzymes. The gastric juice secreted by the gastric glands contains a large amount of water, inactive pepsinogen enzyme and free hydrochloric acid. These glands are embedded in the connective tissue of lamina propria. tThe alimentary canal... See full answer below. All the organs and organ systems are well developed with specific functions. The alimentary canal starts with an aperture which is known as mouth opening. (i) Enterokinase activates the inactive trypsinogen of pancreatic juice to form active trypsin. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. Digestion starts in the buccal cavity of the mouth and ends at the anus. It remains folded forming various pits and different types of glands. The alimentary canal is a long and coiled tube, extending from mouth to amus and distinguished into four main parts - buccopharyngeal cavity (oral cavity + pharynx), oesophagus, stomach and intestine. Although frogs have two sets of teeth in the buccal cavity, they do not use them to eat their prey. Digestion and absorption is completed in small intestine, whereas the indigested food enters rectum by peristalsis for storage and formation of faeces. Median response time is 34 minutes and may be longer for new subjects. The anterior region of the small intestine which curves upwards to form a U with the stomach is the duodenum, the rest part of it continues as the coiled ileum. Login. 5.0 4 votes 4 votes Rate! The Mouth. Teeth – there are two types of teeth. the anus is guarded by anal sphincter. It is traversed by the common bile duct into which the pancreatic ducts also open which is now called as hepatopancreatic duct. It consists of two lobes-the right and the left. Ans: Buccal cavity: Mouth leads into the buccal cavity and it is a wide space between upper and lower halves of the head. Alimentary canal comprises of: The alimentary canal of the frog starts from the mouth opening, which is very wide, extending from one side of the snout to the other. It opens into the stomach in such a way that no demarcation line is formed between the oesophagus and stomach. Enterokinase, thus, activates the trypsinogen to form active trypsin. Buccal respiration in frog: In buccal respiration on land, the mouth stays permanently closed while the nostrils remain open. Amphibia, Chordata, Digestive System of Frog, Frogs, Vertebrates, Zoology. Fundic glands (or cardiac glands in some) have three kinds of cells, mucus neck cells produce mucus, oxyntic cells produce hydrochloric acid, they may be present in the cardiac region also, zymogen cells or peptic cells produce pepsin. Besides these, there are two more patches of teeth found one on either side of the median line of the roof of the buccal cavity, they are called vomerine teeth as they are born on the vomer. 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