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In the presence and absence of what we think of as

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Unformatted text preview: esses go on at all times, ie. in the presence, and absence, of what we think of as ‘food’ in the tube. 4 What happens to GI tract when you sleep 2 15/02/2012 Second brain- enteric nervous system The general structure of the GI ‘tube’ – and it has it’s own nervous system! 1. this single cell layer separates the inside and outside of the body (intestinal epithelium) the second brain also innervates the mucosa The GI ‘tube’ has unique properties… It is about 28 ft. long – thus it has to be folded extensively in the abdominal cavity It has a luminal surface area of between 200 400 square meters – thus the invagination depth/ villus microvillus height and densities of the mucosal layer are extensive in certain zones Has a highly variable ‘transit time’ for an ingested meal with a marker ( 30 80 hours) of which around 5 8 hours is for normal passage through the stomach and small intestine. Senses and expels noxious substances – diarrhea and vomiting Continuously interacts with the resident gut microbiome * consisting of bacteria, archaea, and small eucaryotes and pro...
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