where is the alveoli
alveoli are small air sacs in the lungs as small as a grain of sand there are billions of these in the lungs and the purpose of these alveoli are to supply de oxygenated blood with a supply of oxygen through gas exchangethey are well equipped to do this as well00 million to 400 million alveoli are in each lung each of the alveoli receives blood from the circulatory system capillaries it replaces carbon dioxide and other blood was tes with oxygen