Phgy 210 – Gastric System 1

Phgy 210 – Gastric System 1 - 17:20...

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Phgy 210 – Gastric System 1 17:20 The GIT’s role in homeostasis is to provide nutrients. The food comes from the  external environment, is introduced in the digestive tract where it will be broken  down into small absorbable molecules. It will then be passed along to the internal  environment to be processed, then provided to cells.  GIT structure : In the earthworm, linear from anterior to posterior. The tube has a central  cavity called lumen. It is an extension of the external environment. Tubular nature Communication with external environment Both last 2 points are conserved throughout organisms. Growth : In a 1.5m human, the digestive tract is 4.5m, from the mouth to the anus. The internal surface area lining the lumen is 600x greater than the external  surface area. Gets to a total of 200-250meters square. Differentiation : Sequence of organs, each of which is specialized. Sets of accessory organ : o Salivary gland o Liver o Pancreas  Four layers of tissue : o Serosa   tough layer of connective tissue. o
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This note was uploaded on 04/26/2011 for the course PHGY 210 taught by Professor Trippenbach during the Spring '08 term at McGill.

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Phgy 210 – Gastric System 1 - 17:20...

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