Functioning of the pulmonary and systemic circuits implies significant differences between them, attributed to the destination of blood in one’s body and its nature.
First, the former type is the process of carrying deoxygenated blood from the heart to the lungs, whereas the latter means transferring oxygenated blood from the heart to all other organs.
Second, the pulmonary circuits are performed, as follows from the name, through the pulmonary artery and vein, and systemic circuits happen with the help of the aorta and smaller blood vessels.
Third, they are different in the tasks addressed because the former is intended for releasing carbon dioxide and dissolving oxygen, whereas the latter is aimed at delivering oxygen to the body cells.
Thus, these circuits have varying purposes and organs involved.