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Digestion
The structure of the gut wall
4
Science
Not Applicable
01/23/2005

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Cards

Term
The elimentary canal is a muscular tube running from the mouth to anus and consists of four different layers:
Definition
-Inner mucosa
-Sub-mucosa
-Musclaris externa
-Serosa
Term
Inner mucosa
Definition
Lines the gut wall, secretes mucus, which lubricates the passage of food so helps to protect the gut from damage.
Term
The sub mucosa
Definition
Contains blood and lymph vessels, which take away the absorbed food products. It also contains a rich network of nerve fibres that co-ordinate the muscular contractions involved in peristalsis.
Term
Mascularis externa
Definition
Consists two layers of muscles running in different directions: the inner circular muscle with fibres arranged in rings and the outer longitudinal with fibres running lengthways.Both layers are made up of smooth involuntery muscles that drive peristalsis.
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