What structures in the small intestine assist with nutrient absorption?

The correct choice highlights the role of villi and microvilli in nutrient absorption in the small intestine. Villi are small, finger-like projections that line the intestinal wall, increasing the surface area available for absorption. This increased surface area is crucial because it allows for more efficient uptake of nutrients, such as sugars, amino acids, and fatty acids, from the digested food.

On top of the villi are even smaller projections known as microvilli, which form what is referred to as the "brush border." This structure further amplifies the absorptive surface, making the small intestine highly effective at absorbing nutrients and minerals from the chyme (partially digested food mixed with digestive juices) that passes through it.

The combined action of villi and microvilli ensures that the small intestine can maximize nutrient absorption, which is essential for overall health and well-being.