Deep folds of both the mucosa and submucosa in the small intestine that increase surface are known as ________.

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Circular folds, also known as plicae circulares, are deep folds of both the mucosa and submucosa that increase the surface area of the small intestine, thereby increasing the absorption of nutrients. Microvilli and villi are smaller structures that further increase the surface area, while haustra are pouch-like structures found in the large intestine.

Deep Folds of Both the Mucosa and Submucosa in the Small