What are the finger-like projections in the small intestine called?

The finger-like projections in the small intestine are called villi. These structures play a crucial role in the digestive process by increasing the surface area available for absorption. Each villus is covered with even smaller hair-like structures known as microvilli, which further enhance the absorption capability of the intestinal lining. The presence of villi is vital because the small intestine is responsible for the digestion and absorption of nutrients from the food we consume. The large surface area created by these projections ensures that the body can efficiently absorb the maximum amount of nutrients, vitamins, and minerals necessary for overall health.

In contrast, crypts are invaginations that are found between the villi but do not absorb nutrients. Folds refer to larger structures in the intestinal lining which also serve to increase surface area but are not defined as finger-like projections. Microvilli, while critical for absorption, are not the projections themselves but rather the tiny extensions on the villi that enhance their function. Thus, villi are specifically identified as the finger-like projections that play a significant role in nutrient absorption within the small intestine.