Amphibia
mphibiaAmphibia
Digestive System: 1. The digestive system of frog is mainly includes the food catching organs, the alimentary canal and the digestive glands. 2. 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.
Alimentary canal: 1. The alimentary canal of the frog is essentially a colied tube of varyihng diameter that extends from one of the body to other. 2. Towards the anterior end it opens through a mouth but at the posterior end it opens through a cloacal aperture as undigested food and reproductive bodies both are removed side by side through this aperture. 3. It consists of the buccal cavity, pharynx, oesophagus, stomach and intestine.
Buccal Cavity: 1. The alimentary canal starts with an aperture which is known as mouth opening. 2. Mouth leads into a wide and broad cavity called buccal cavity which lays in between the two jaws- the upper jaw and tha lower jaw. 3. The upper jaw is fixed or immovable, while the lower jaw is hinged and can be freely moved up and down in the vertical plane. 4. The upper jaw bears a row of closely set, small, uniform and hook like pointed maxillary teeth but the lower jaw lacks teeth. 5. Besides maxillary teeth 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. 6. The teeth are small in size and uniform in structure. 7. They are not used for chewing but prevent the escape of the captured pray. 8. They are curved backwards and attached to the bones instead of being set in sockets. 9. Each tooth is conical in its shape and consists of two parts- the base and the crown. 10. The base forms the roof of the tooth by which it is attached to the jaw. 11. The crown is the free end of tooth
Digestive System: 1. The digestive system of frog is mainly includes the food catching organs, the alimentary canal and the digestive glands. 2. 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.
Alimentary canal: 1. The alimentary canal of the frog is essentially a colied tube of varyihng diameter that extends from one of the body to other. 2. Towards the anterior end it opens through a mouth but at the posterior end it opens through a cloacal aperture as undigested food and reproductive bodies both are removed side by side through this aperture. 3. It consists of the buccal cavity, pharynx, oesophagus, stomach and intestine.
Buccal Cavity: 1. The alimentary canal starts with an aperture which is known as mouth opening. 2. Mouth leads into a wide and broad cavity called buccal cavity which lays in between the two jaws- the upper jaw and tha lower jaw. 3. The upper jaw is fixed or immovable, while the lower jaw is hinged and can be freely moved up and down in the vertical plane. 4. The upper jaw bears a row of closely set, small, uniform and hook like pointed maxillary teeth but the lower jaw lacks teeth. 5. Besides maxillary teeth 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. 6. The teeth are small in size and uniform in structure. 7. They are not used for chewing but prevent the escape of the captured pray. 8. They are curved backwards and attached to the bones instead of being set in sockets. 9. Each tooth is conical in its shape and consists of two parts- the base and the crown. 10. The base forms the roof of the tooth by which it is attached to the jaw. 11. The crown is the free end of tooth