Biology / Bio 2773 · Atom · ~20 seconds
Esophagus and Peristalsis
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The esophagus moves a swallowed bolus toward the stomach through peristalsis, a unidirectional wave of smooth muscle contraction.
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Peristalsis pushes food toward the stomach regardless of body orientation, so swallowing works even lying down.
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The esophagus produces no digestive enzymes of its own — only lubricating mucus.