CIRCULATORY- DIGESTIVE

-       - Villi play a very important role in digestion but it is also  essential for the absorption of digested nutrients. The cells of the villi and another part of the small intestine, that transports food from the digestive tract into the bloodstream, where the body can use them.

-       - The villi aid in absorption by increasing the surface area of the intestine and contain specialized cells which transport different types of nutrients into the blood.