Bile flows into a tube called the common bile duct, into which pancreatic juice, a digestive juice from the pancreas, also flows. Bile is a digestive juice made by the liver and stored in the gallbladder. From the esophagus, swallowed food moves into the stomach and then into the small intestine. The digestive system consists of the organs of the digestive tract, or food tube, and the digestive glands. In the pharynx, there are several openings: one into the esophagus, the tube into which food is swallowed one into the glottis, through which air enters the larynx, or voice box and two into the Eustachian tubes, which connect the pharynx to the ear. Also inside the mouth behind the tongue is the pharynx, or throat. Inside the mouth are two internal nares, or openings into the nostrils two vomerine teeth in the middle of the roof of the mouth and two maxillary teeth at the sides of the mouth. The third lid, called the nictitating membrane, is transparent. On the outside of the frog’s head are two external nares, or nostrils two tympani, or eardrums and two eyes, each of which has three lids. As members of the class Amphibia, frogs may live some of their adult lives on land, but they must return to water to reproduce.
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