Small Intestine: Villi and Microvilli
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The small intestine's folded lining bears finger-like villi, each covered in microscopic microvilli, multiplying its surface area for nutrient absorption into the bloodstream.
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Absorbed nutrients travel first through the hepatic portal vein to the liver before reaching general circulation.
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Villi and microvilli are structurally distinct folds at two different size scales, not the same structure under two names.