Ingestion
The first activity of the digestive system is to take in food through the mouth. This process, called ingestion, has to take place before anything else can happen.
The large pieces of food that are ingested have to be broken into smaller particles that can be acted upon by various enzymes. This is mechanical digestion, which begins in the mouth with chewing or mastication and continues with churning and mixing actions in the stomach.
Elimination
The food molecules that cannot be digested or absorbed need to be eliminated from the body. The removal of indigestible wastes is in the form of feces, is defecation or elimination.
Parts of the digestive system
Mouth, salivary glands, esophagus, liver, stomach, pancreas, small intestines, large intestines, and the rectum.
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