Biology, 03.02.2021 01:30, cayden81

During peristalsis a. muscles contract voluntarily to move food in one direction

b. muscles contract voluntarily to move food up and down the esophagus

c. muscles contract involuntarily to move food up and down the
esophagus

d. muscles contract involuntarily to move food in one direction

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During peristalsis a. muscles contract voluntarily to move food in one direction

b. mus...