The digestive tract has no joke function.

The digestive system consists of digestive tract and digestive glands. The place where food begins to digest is the mouth. Starch can be digested into maltose under the action of salivary amylase in the mouth. Esophagus, pharynx and anus have neither digestive function nor absorption function; The stomach is the largest part of the digestive tract, which can store food and digest protein. Small intestine is the main place for digestion and absorption, which contains folds and villi, as well as a variety of digestive juices. The largest digestive gland in the human body is the liver, and the bile secreted does not contain digestive enzymes. The digestive juice secreted by pancreas and intestinal gland contains many digestive enzymes, which is the most important digestive gland in human body.

So the answer is: (1) digestive tract; Digestive gland; Oral cavity; Esophagus, pharynx and anus; Stomach; Small intestine; Liver; Pancreas; Intestinal glands.