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Frogs Internal Morphology

Since the frogs are carnivorous, their alimentary canal is short in length

Zoology [Science]

Central Board of Secondary Education [12]

2/22/2010Print This PageTell - A - FriendAdd to Wish ListReport Error

Frog - Internal Morphology

Digestive System

  1. Since the frogs are carnivorous, their alimentary canal is short in length.
     
  2. Tadpole larva is herbivorous so alimentary canal is very long coiled in the form of spring.

  3. The mouth is present as terminal, wide opening. It opens into bucco- pharyngeal cavity, which contains numerous maxillary teeth arranged along the margin of the upper jaw and vomerine teeth present in the roof of the buccopharyngeal cavity. The lower jaw is toothless. Salivary glands are absent.

  4. Opening of eustachian tube, vocal sac (only in male) gullet and glottis can be seen clearly in the bucco-pharyngeal cavity.

  5. The muscular tongue is bilobed at the tip and free from behind. It is used for capturing the prey.

  6. The gullet opens in narrow and short tube-like oesophagus, which continues in large and distended stomach. It contains a thick muscular layer, which helps in converting food into chyme. It secretes gastric juice containing HCL and proteolytic enzymes. Stomach is followed by a coiled small intestine. Intestinal wall has numerous finger-like folds,, called villi and microvilli, projecting into its lumen to enhance surface area of absorption of digested food. The first part of the small intestine lying parallel to stomach is called duodenum. Intestine continues into a wider rectum, opening into cloaca. The urinary bladder opens into cloacal chamber through the ureter.
     
  7. The gastric and intestinal glands occur in the wall of stomach and intestine , respectively. The outer important digestive glands associated with the alimentary canal are liver and pancreas. Liver secretes bile, which is temporarily stored in gall bladder before being released into the duodenum. Bile helps in digestion of food by changing its pH from acidic to alkaline and by emulsifying the fat. Liver does not secrete any digestive enzyme. Pancreas  is an irregular, elongatedgland, situated in a thin mesentery and lies parallel to the stomach. It produces pancreatic juice containing digestive enzymes like trypsin, amylopsin, etc.

2/22/2010Print This PageTell - A - FriendAdd to Wish ListReport Error

Related Words:

Frogs Internal Morphology, Carnivorous, Alimentary Canal, Tadpole Larva, Bucco Pharyngeal Cavity, Maxillary Teeth, Vomerine Teeth, Salivary Glands, Eustachian Tube, Vocal Sac, Glottis, Muscular Tongue, Bilobed, Oesophagus, Duodenum, Liver, Pancreas, Alimentary Canal Of Frog, Digestive Glands Of Frog

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