Stuff You Forgot from School by Caroline Taggart

Author:Caroline Taggart
Language: eng
Format: epub
Publisher: Reader's Digest

• THE DIGESTIVE SYSTEM

The digestive process is divided into four parts:• ingestion: eating food

• digestion: breaking the food down into constituent parts

• absorption: extracting nutrients from the food

• elimination: disposing of waste

Once you swallow food or drink, it enters the esophagus, or gullet, and passes (through a process of muscular contraction called peristalsis) into the stomach. From there it continues into the small intestine (comprising the duodenum, jejunum, and ileum), where digested food is absorbed into the bloodstream. The whole process is helped by the secretion of enzymes. One of the effects of the digestion of protein (which enters the body via meat, fish, eggs, etc.) is the release of amino acids, which are the building blocks of the protein the body needs for all sorts of different purposes.

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