The mechanical digestion processes in the large intestine is commonly referred to as peristalsis. The colon is the last stop in the digestive system and this where liquids are extracted from non-nutritive food waste before excretion.
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As far as I know there is no digestion at all in the large intestine, only absorption.
When food passes from mouth, it goes deeper and deeper and enters in small intestine. most of the digestion takes place in small intestine. then it moves from small to large intestine......