What happens to the rugae when the stomach fills with food?
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When the stomach is empty, the walls are folded into rugae (stomach folds), which allow the stomach to expand as more food fills it. ... Here, peristaltic contractions (mechanical digestion) churn the bolus, which mixes with strong digestive juices that the stomach lining cells secrete (chemical digestion).
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When the stomach is empty, the walls are folded into rugae (stomach folds), which allow the stomach to expand as more food fills it.
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