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During peristalsis muscles contract voluntarily to move food up and down the esophagus muscles contract involuntarily to move food in one direction muscles contract involuntarily to move food up and down
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During peristalsis

muscles contract voluntarily to move food up and down the esophagus

muscles contract involuntarily to move food in one direction

muscles contract involuntarily to move food up and down the esophagus

muscles contract voluntarily to move food in one direction

User Nikola Mitic
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I knew this at one point but I forgot it

User Christopher Grigg
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