Define peristalsis._ human digestive system
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Peristalsis is a radially symmetrical contraction and relaxation of muscles that propagates in a wave down a tube, in an anterograde direction
this process usually takes place in the esophageaus and small intestine
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The contraction and relaxation of muscles may be referred as peristalsis.
It begins in the esophagus when a bolus of food is swallowed.
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