Editing Gastrointestinal tract (section)

=====Mucosa=====
{{See also|Oral mucosa|Gastric mucosa}}
The mucosa is the innermost layer of the gastrointestinal tract. The mucosa surrounds the [[lumen (anatomy)|lumen]], or open space within the tube. This layer comes in direct contact with digested food ([[chyme]]). The mucosa is made up of:
* [[Intestinal epithelium|Epithelium]] – innermost layer. Responsible for most digestive, absorptive and secretory processes.
* [[Lamina propria]] – a layer of connective tissue. Unusually cellular compared to most connective tissue
* [[Muscularis mucosae]] – a thin layer of [[smooth muscle]] that aids the passing of material and enhances the interaction between the epithelial layer and the contents of the lumen by agitation and [[peristalsis]]

The mucosae are highly specialized in each organ of the gastrointestinal tract to deal with the different conditions. The most variation is seen in the epithelium.