So blood moves: heart→artery→arteriole→capillary→venule→vein→heart. This is called circulation. There are two different "circulations" in the circulatory system. The "systemic circulation" is how blood goes to most of the body. The "pulmonary circulation" is how blood goes through the lungs. (Pulmonary means ¨about the lungs¨). This is how it works in mammals, including humans. Circulatory systems of other vertebrates differ somewhat.