The digestive system is the series of tubelike organs that ... The resulting semifluid paste—chyme—is sealed in the stomach by two ringlike sphincter muscles for several hours and then ...

There are two primary parts of the digestive system: The GI (gastrointestinal) tract, through which food passes and is broken down. The biliary tract produces juices such as bile and enzymes to ...

This article also explains the functions of other parts of the digestive system. The mouth is the beginning ... its surface called papillae, which have two different functions.