Rugae refer to what in the digestive system?

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Multiple Choice

Rugae refer to what in the digestive system?

Explanation:
Rugae are the deep folds in the stomach wall that allow the organ to expand as you eat. They’re formed by the mucosa and submucosa, which lets the stomach stretch to hold a larger volume, and then flatten out as it fills to keep the lining smooth for mixing and emptying. This is different from the finger-like projections in the small intestine, which are villi and increase absorption surface, and from the muscular layer around the intestine, which is the muscularis externa that drives movement. The inner lining of the stomach is the mucosa, but the rugae themselves are folds within that lining, not merely the lining alone.

Rugae are the deep folds in the stomach wall that allow the organ to expand as you eat. They’re formed by the mucosa and submucosa, which lets the stomach stretch to hold a larger volume, and then flatten out as it fills to keep the lining smooth for mixing and emptying. This is different from the finger-like projections in the small intestine, which are villi and increase absorption surface, and from the muscular layer around the intestine, which is the muscularis externa that drives movement. The inner lining of the stomach is the mucosa, but the rugae themselves are folds within that lining, not merely the lining alone.

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