The lungs have a dual blood supply. The pulmonary arterial circulation, a high - compliance, low - pressure system that terminates in the pulmonary capillary bed, is responsible for gas exchange.
double circulation means blood flowa twice at same time throgh heart to the lungs and body tissue. actually it is called pulmonary circulation and systemic circulation
The majority of mammals (including humans) utilize a double circulatory system. This means that we have two loops in our body in which blood circulates. One is oxygenated, meaning oxygen rich, and the other is deoxygenated, which means it has little to no oxygen, but a lot of carbon dioxide.

Double circulatory systems are important because they ensure that we are giving our tissues and muscles blood full of oxygen, instead of a mixture of oxygenated and deoxygenated blood. While it may take a bit more energy than a single circulatory system, this system is much more efficient!