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The gastrointestinal tract also is a prominent part of the immune system.[4] The surface area of the digestive tract is estimated to be the surface area of a football field. With such a large exposure, the immune system must work hard to prevent pathogens from entering into blood and lymph.[5]
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en.wikipedia.org/wiki/Gastrointestinal_tract
en.wikipedia.org/wiki/Gastrointestinal_tract
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Digestion - Wikipedia, the free encyclopedia
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Digestion is the mechanical and chemical breaking down of food into smaller components, to a form that can be absorbed, for instance, by a blood stream. Digestion is a form of catabolism. In mammals,...
en.wikipedia.org/wiki/Digestion
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The alimentary canal (also called the digestive tract) is the long tube of organs — including the esophagus, the stomach, and the intestines — that runs from the mouth to the anus. An adult's digestive tract is about 30 feet long.
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kidshealth.org/teen/your_body/body_basics/digestive_sys...
kidshealth.org/teen/your_body/body_basics/digestive_system.html
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The digestive system is made up of the alimentary canal (also called the digestive tract) and the other abdominal organs that play a part in digestion, such as the liver and pancreas.
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kidshealth.org/parent/general/body_basics/digestive.htm...
kidshealth.org/parent/general/body_basics/digestive.html
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Digestion involves mixing food with digestive juices, moving it through the digestive tract, and breaking down large molecules of food into smaller molecules. Digestion begins in the mouth, when you chew and swallow, and is completed in the small intestine.
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digestive.niddk.nih.gov/ddiseases/pubs/yrdd/
digestive.niddk.nih.gov/ddiseases/pubs/yrdd/
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Many people believe that too much gas causes abdominal bloating. However, people who complain of bloating from gas often have normal amounts and distribution of gas. They may just be unusually aware of gas in the digestive tract.
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digestive.niddk.nih.gov/ddiseases/pubs/gas/
digestive.niddk.nih.gov/ddiseases/pubs/gas/
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Physical and chemical modification (digestion) depends on exocrine and endocrine secretions and controlled movement of food through the digestive tract.
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www.leeds.ac.uk/chb/lectures/anatomy8.html
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