GENERAL HISTOLOGY

Detailed explanation-1: -The villi in the small intestine provide a large surface area with an extensive network of blood capillaries. This makes the villi well adapted to absorb the products of digestion by diffusion and active transport. Each villus is covered in many microscopic microvilli.

Detailed explanation-2: -Villi are filled with blood capillaries, and the blood constantly moving in them means that a steep concentration gradient is maintained. This increases the amount of dissolved, digested food that can be absorbed into the bloodstream from the small intestine.

Detailed explanation-3: -The walls of the small intestine have finger-like projections called villi which increase the surface area is the one way in which the small intestine is adapted for the absorption of digested food.

Detailed explanation-4: -The structure of the small intestine is designed for absorption of nutrients. The inside of the small intestine is lined with villi that absorb nutrients from the liquid mixture called chyme produced in the stomach from the food we eat.

Detailed explanation-5: -Adaptations of Villi Villi have a wall only one cell thick so the nutrients only have a short distance to diffuse into the blood. Villi have capillaries inside them for a good blood supply to allow for quick diffusion into the blood. Villi have a large surface area to allow quicker diffusion.