Welcome to NotesOnZoology.com! This trait facilitates movements of the eyeballs into the buccal cavity (usually termed eye retraction in the literature, e.g., ... a further function of the large interpterygoid vacuities and the associated eye muscles in frogs and salamanders has been hypothesized for breathing. From the buccal cavity it is pushed into oesophagus by the contraction of the pharyngeal wall and thence by peristalsis caused by the contraction and dilation of muscular wall of oesophagus, into the stomach. On the floor of the buccal cavity lies a large muscular sticky tongue. Respiration , nutrition e.t.c. ... How is the coloration of the frog different from the ventral to the dorsal side? The alimentary canal of the frog is essentially a coiled tube of varying diameter that extends from mouth to cloacal aperture. Bile juice also activates the fat digesting enzyme of the pancreas, the lipase. 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. It is composed of very much thin connective tissue layer and an outer layer of flattened cells. These cells are somewhat spherical and arranged in compact groups and take light stain. The esophagus’s glandular lining secretes an alkaline digestive fluid. The Buccal Cavity of frog is the mouth of the frog. Respiration , nutrition e.t.c. It is separated by the palate and functions as an entrance to the digestive system and is composed of the teeth, tongue, and palate. Hence, frog respires through gills, lungs, buccal cavity and skin in its life cycle. The pyloric end of stomach is constricted and its opening into small intestine is guarded by sphincter (a circular ring-like muscle). The internal mucous forms the low transverse folds. The lobules have numerous branching tubules or acini or alveoli. It is a greenish alkaline fluid which contains no digestive enzymes so that it does not take any part in the digestion of food. Vocal sacs are outpocketings of the floor of the mouth, or buccal cavity. After closure of the nares, the buccal floor was rapidly elevated by the activity of the breathing muscles and air was forced into the lungs from the buccal cavity. The alimentary canal of the frog is complete. Gardiner’s frogs from the Seychelles islands … Bile has no digestive purpose; it only emulsifies fats for proper digestion. Thus, the food is thoroughly digested with the help of these enzymes. Although frogs have two sets of teeth in the buccal cavity, they do not use them to eat their prey. The left lobe is again subdivided into two lobes. The liver secretes a watery, alkaline bile which contains bile salts, bile pigments, cholesterol, lecithin and water. Answer. When it is in water, it respires through skin (cutaneous respiration). It is always opened during breathing but closes while food is being swallowed. 5.0 4 votes 4 votes Rate! It is in the form of wide and curved tube and lies between the oesophagus and intestine. The food as it enters the duodenum is acidic due to the presence of HCl secreted by the oxyntic cells of the gastric glands of the stomach. The liver performs the following important functions: 1. The longitudinal foldings of the esophagus allow its expansion during the passage of food into the stomach. Respiratory System. The stomach performs the following three main functions: As soon as food reaches the stomach, its wall shows a series of muscular contractions, the so-called peristaltic movements which not only allow the food to go down but also break down into small pieces and mix it thoroughly with gastric juice secreted by the gastric glands situated in the internal lining of stomach. Digestion starts in the buccal cavity of the mouth and ends at the anus. C. Tongue and roof of buccal cavity. Privacy Policy3. It stores excess sugar in the form of glycogen, which is formed by the change of glucose (glycogenesis). During feeding whatever the food is ingested by the animal that contains complex organic substances which are not of immediate use as they are insoluble and cannot diffuse through the mucous membrane lining of the alimentary canal, therefore, they must be subjected to the physical and chemical changes of the digestion so that they may be transformed into soluble forms for the immediate use of the body. A human ; it only emulsifies fats, thus, three substances mix with. Narrow, very much coild tube and its opening into small intestine be reformed mode. Food soft together as the Bucco-pharyngeal cavity membrane lining is thrown into numerous folds, there... Acids mix with bile salts, bile, pancreatic juice which contains digestive! 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