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Small Intestine - Anatomy & Physiology (view source)
Revision as of 15:24, 9 July 2008
, 15:24, 9 July 2008no edit summary
*[[Jejunum - Anatomy & Physiology]]
*[[Jejunum - Anatomy & Physiology]]
*[[Ileum - Anatomy & Physiology]]
*[[Ileum - Anatomy & Physiology]]
==Function==
*To mix content and transport chyme.
*Contraction of the two muscle layers facilitates mixing and transportation.
*There ane two types of muscle contraction:
**'''Segmental'''
***Rhythmic contraction of ''circular muscle''.
***Creates ring like contractions
***Divides content into many segments
***Moves segments backwards and forth causing mixing with digestive juices
***This type of contraction predominates during digestion
**'''Peristaltic'''
***Antagonistic contraction of longitudinal and circular muscle
***Transports chyme through the small intestine but contractions can be weak to allow time for absorption
*When a peristaltic ‘’wave’’ of contraction reaches the end of the ileum, another starts in the duodenum. This is known as a ''migrating myoelectric complex''.