poop13456 poop13456
  • 01-03-2022
  • Biology
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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

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acoren28
acoren28 acoren28
  • 01-03-2022

I knew this at one point but I forgot it

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