Alveoli, small air sacs, are essential in the completion of a life process, gas exchange. Gas exchange is the process in which the body replenishes oxygen and eliminates carbon dioxide. This process begins when air is entered through the mouth/nose of an individual, passes through the throat, moves through the voice box, enters the trachea, and moves through small branches of the bronchus, bronchioles. Gas is then exchanged in the alveoli, which is made possible by the moist thin walls of the alveoli, as well as its capillaries. Capillaries are tiny blood vessels that play an important role in the gas exchange process. They exchange blood from the arteries to the veins. Alveoli share a cell membrane with capillaries, allowing for the exchange
