Respitory System Function

In order to make your body work, cells need oxygen or O. When you take a breath, the air you just breathed enters your lungs which is surrounded by capillaries. The oxygen passes through the walls of air sacks and goes into the capillaries. Red blood cells pick up the oxygen from the capillaries. Red blood cells also release the waste gas {otherwise called carbon dioxide} into the lung sacs. When you breathe out, carbon dioxide goes out into the air. Then the trees and plants pick it up, then turns it into oxygen again. The respitory system works interdependently with the circulatory sytem because breathing transports oxygen to the blood and carries carbon dioxide away from the blood.