"The circulation is that the portion of the cardiovascular system which carries deoxygenated blood faraway from the proper ventricle to the lungs, and returns oxygenated blood to the left atrium of the heart and ventricle of the heart. The term circulation is quickly paired and contrasted with the circulation. The vessels of the circulation are the pulmonary arteries and therefore the pulmonary veins.
A separate system referred to as the bronchial circulation supplies oxygenated blood to the tissue of the larger airways of the lungs. Deoxygenated blood leaves the guts, goes to the lungs, then re-enters the heart; Deoxygenated blood leaves through the proper ventricle through the arteria pulmonalis. From the proper atrium, the blood is pumped through the right atrioventricular valve (or right atrioventricular valve), into the proper ventricle. Blood is then pumped from the proper ventricle through the semilunar valve and into the most arteria pulmonalis ."