Role of Villi - absorption of nutrients from the food.Role of alveoli - to exchange oxygen and carbon dioxide molecules to and from the bloodstream

1.Villi is found in small intestine.Functions of the Villi. We've already stated that the small intestine's main job is to absorbnutrientsfrom the food you eat and that your villi help by increasing the surface area the intestine has forabsorption.

2.Alveoli are an important part of therespiratory systemwhose function it is to exchange oxygen and carbon dioxide molecules to and from the bloodstream. These tiny, balloon-shaped air sacs sit at the very end of the respiratory tree and are arranged in clusters throughout the lungs.

Alveoli:-It is the place where exchange of gas take place.It increase the surface area so that more oxygen or carbon dioxide can pass.

Villi:-It is finger like projection present in small intestine.It's function is to absorb the required material from the digested food.It also increase the surface area so that the process of absorption be increased