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Pulmonary circulation is the portion of the cardiovascular system which carries deoxygenated blood from the heart, to the lungs, and returns oxygenated (oxygen-rich) blood back to the heart.
Bronchial circulation is the part of the circulatory system that supplies nutrients and oxygen to the cells that constitute the lungs, as well as carrying waste products away from them. It is complementary to the pulmonary circulation that brings deoxygenated blood to the lungs and carries oxygenated blood away from them in order to oxygenate the rest of the body.