The third body region or trunk may attain a great length, one or two feet, or even more, and is also muscular, but the truncal muscles are of subordinate importance in locomotion, serving principally to promote the peristaltic contractions of the body by which the food is carried through the gut. [Please select]
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The peristaltic action of the esophagus carries the irritant along quickly, but here it remains quiet in contact with one surface, destroying it. [Please select]
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