How does circulatory and the breathing system correlate together?

The respiratory system inhales oxygen and then is ped onto the cardiovascular system, by entering the red blood cells, which are pumped by the heart around the body to all the cells and organs. After that the red blood cells carry back the de-oxygenated blood, which is the carbon dioxide back to the heart, which then lets it to enter the lung, through the artery, into the lung. This is then exhaled out of the body by the lung, which means that the respiratory system inhales, cardiovascular supplies the oxygen around the body, and then respiratory exhales carbon dioxide out of the body