(Translated by https://www.hiragana.jp/)
Frog Digestive System Diagram - TutorVista.com
The Wayback Machine - https://web.archive.org/web/20100603080405/http://www.tutorvista.com:80/biology/frog-digestive-system-diagram

Frog Digestive System Diagram


Unlimited Tutoring & Homework Help
  • Instant Help. Connect to a Tutor Now. »   
  • K-12, College and AP Exams
  • 24 x 7 Private Tutoring

The Digestive system of frog

The digestive system of frog  consists of two parts

  •  Alimentary canal
  •  Digestive glands.

Frog Digestive system diagram

Alimentary Canal

The alimentary canal is short because frogs are carnivores and hence the length of intestine is reduced. alimentary canal consists of t the following parts

  • Mouth
  • Buccal cavity
  • Pharynx
  • Oesophagus
  • Stomach
  • Small intestine
  • Large intestine
  • Cloaca

 

The frog's digestive system begins with the mouth. Mouth is terminal and wide.

It leads to buccal cavity. The roof of buccal cavity has a row of maxillary teeth along the margin. It has three subrostral fossae, apair of internal nares, two patches of vomerine teeth and two large bulging of eye balls. On the floor of buccal cavity there are three prelingual elevations and a large muscular sticky eversible tongue.

Tongue is blobbed and free behind and fixed infront.

The pharynx contains openings of Eustachian tubes, vocal sacs in male’s gullet and glottis. The tongue is used to capture the prey. Teeth are not used in mastication. Food is swallowed entire.

The gullet opens into a narrow oesophagus that leads into a wide a wide, tubular, slightly curved stomach.

The stomach is followed by a long, narrow tube, the small intestine. It has a short straight duodenum running forward parallel to the stomach, a long ileum which is coiled. The folding in the small intestine on the inner surface to increase the area of absorption of digested food. The ileum leads into a short ,wide and straight rectum which opens in to a short cloaca.

A bilobed urinary bladder also opens into the cloaca.

Digestive Glands

The major digestive glands are:

  • Gastric glands,
  • Liver,
  • Pancreas
  • Intestinalglands.

 

Gasric glands are tiny glands found in the wall of stomach. Gastric glands secrete gastric juice which contains HCl and protein digesting enzymes.

Liver is large bilobed chocolate brown colored gland hanging by a mesentery in the anterior part of the body cavity. A spherical bluish green sac called gall bladder is seen in between the two lobes of liver. The liver secretes bile which is stored in the gall bladder. Bile helps in the digestion by changing the PH of food from acidic to alkaline, and by emulsifying the fat in the food. Liver does not secrete any digestive enzymes.

The pancreases is an irregular, elongated cream colored gland situated in a thin mesentry, and lying parallel to the stomach, but against the duodenum. Pancreatic juice secreted by pancreas contains many enzymes like trypsin lipase amylase chymotrypsin etc

Intestinal glands are numerous tiny glands situated on the wall of small intestine. The intestinal juice produced by these glands contain many enzymes helps in the digestion.                                                                                        

Digestion

Food is captured by the bilobed tongue. Digestion of food takes place by the action of HCl and gastric juices secreted from the walls of the stomach. Partially digested food called chyme is passed from stomach to the first part of the intestine, the duodenum. The duodenum receives bile from gall bladder and pancreatic juices from the pancreas through a common bile duct. Bile emulsifies fat and pancreatic juices digest carbohydrates and proteins. Final digestion takes place in the intestine. Digested food is absorbed by the numerous finger-like folds in the inner wall of intestine called villi and microvilli. When the food passes into the large intestine, the water is reabsorbed and wastes are routed to the cloaca. All wastes exit the body through the cloaca and the cloacal vent. The undigested solid waste moves into the rectum and passes out through cloaca.

Food and Feeding Habit

The frog is carnivorous feeding on small moving insects,crustaceans,worms,spiders,larvae etc.