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===Duodenum===
 
===Duodenum===
   −
*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.
 
*Epithelium is simple columnar - ideal for absorption.
 
**Epithelial cells are known as enterocytes.
 
**Epithelial cells are known as enterocytes.
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*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.
 
*Crypts are present at the base of each villus.
 +
 +
Produces an alkaline secretion, which neutralises stomach acid, and digestive enzymes.
    
===Jejunum===
 
===Jejunum===
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