In this circulation the blood leaves the left ventricles and enters the aorta. From here the blood is sent to the smaller arteries and the arterioles, and then finally to the capillaries. The oxygen is then comes in the blood in replacement of the waste and carbon dioxide. The blood to the veins then carries the waste away or we can say to the venious capillaries, and then the inferior vena cava and the superior vena cava, thus entering of the blood to the heart at the right atrium.