*Contraction of the two muscle layers facilitates mixing and transportation.
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*There ane two types of muscle contraction:
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**'''Segmental'''
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***Rhythmic contraction of ''circular muscle''.
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***Creates ring like contractions
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***Divides content into many segments
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***Moves segments backwards and forth causing mixing with digestive juices
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***This type of contraction predominates during digestion
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**'''Peristaltic'''
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***Antagonistic contraction of longitudinal and circular muscle
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***Transports chyme through the small intestine but contractions can be weak to allow time for absorption
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*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''.