A frog’s digestive system is made up of the esophagus, stomach, intestines, rectum, cloaca and cloacal aperture. Ureters empty the kidneys into the cloaca for excretion. Other organs involved in digestion in amphibians are the liver and gallbladder.
Frogs have a digestive system very similar to that of other vertebrate organisms. Food harnessed by the long tongue of the frog is swallowed whole and travels down the esophagus. Even though frogs swallow their food whole, they have two sets of teeth: vomerine and maxillary teeth. The glottis prevents food particles from getting into the respiratory tract, while the gallbladder neutralizes food digested in the stomach and stores bile.
Chemically digested food exits the stomach through the pyloric sphincter. The hepatopancreatic duct excretes enzymes into the digestive tract to assist digestion. Chime from the intestines absorbs nutrition from the food, while waste matter from digestion as well as urinary waste from the kidneys collect in the cloaca. The waste is excreted from the cloacal aperture.
The digestive system of the frog larva, the tadpole, is very similar. The food travels through the digestive tract, beginning at the mouth and goes through the esophagus, stomach and intestines. However, in tadpoles, waste is excreted through the body’s wall.