Biology / Unit 12 Bio 2777 short lesson, about 20 seconds
Small Intestine: Villi and Microvilli
Captions available
The idea
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.
In practice
Absorbed nutrients travel first through the hepatic portal vein to the liver before reaching general circulation.
Where people slip
Villi and microvilli are structurally distinct folds at two different size scales, not the same structure under two names.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Something wrong in this lesson? Flag it · Sources for Biology