1.The inner walls of the small intestine have thousands of finger-like outgrowths.
These are called villi (singular villus).
2.The villi increase the surface area for absorption of the digested food.
3.Each villus has a network of thin and small blood vessels close to its surface.
4.The surface of the villi absorbs the digested food materials and carries them to the bloodstream.
It is hence from the bloodstream, the absorbed food is delivered to each and every cell of the body.