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Small Intestine - Anatomy & Physiology (view source)
Revision as of 19:27, 5 July 2008
, 19:27, 5 July 2008→Duodenum
*Produces an alkaline secretion, which neutralises stomach acid, and digestive enzymes.
*Produces an alkaline secretion, which neutralises stomach acid, and digestive enzymes.
*The mucosa is arranged into villi that provide a large surface area for absorption.
*The mucosa is arranged into villi that provide a large surface area for absorption.
*Epithelium is simple columnar - ideal for absorption. A single layer of cells overlies the lamina propria. Epithelial cells originate from progenitor cells that migrate from mucosal crypts. They differentiate as they migrate up the villus.
*Epithelium is simple columnar - ideal for absorption.
**Epithelial cells are known as enterocytes.
**A single layer of enterocytes overlies the lamina propria.
**Enterocytes originate from progenitor cells that migrate from mucosal crypts. They differentiate as they migrate up the villus.
**Enterocytes ane absorptive and posses microvilli.
**Membrane bound enzymes and transport proteins are also within the epithelium.
*Each villus houses capillaries that transport amino acids, monosaccharides and other digestive products and lacteals that transport triacylglycerides.
*Each villus houses capillaries that transport amino acids, monosaccharides and other digestive products and lacteals that transport triacylglycerides.
*Crypts are present at the base of each villus.
===Jejunum===
===Jejunum===