The heart functions as a double pump. The right side serves as the Pulmonary Circulation pump, shunting the carbon dioxide rich blood entering its chambers to the lungs to unload carbon dioxide and pick up oxygen and then back to the left side of the heart. ( the function of this circuit is strictly to provide gas exchange)The second circuit which carries oxygen rich blood from the left heart through body tissue and back to the right heart is called Systemic Circulation. It provides the functional blood supply to all body tissues.Pulmonary circulation is to your heart and systemic is everywhere else in your bodydenoting the part of the circulatory system concerned with the transportation of oxygen to and carbon dioxide from the body in general, especially as distinct from the pulmonary par