Circulation

flowchart LR
subgraph body
    direction BT
    subgraph heart
        direction TB
        subgraph right
            direction TB
            ra --> rv
        end
        subgraph left
            direction TB
            la --> lv
        end
        rv-.-lv
        ra-.-la
    end
        subgraph syscirc
        direction BT
        aorta[Aorta] --> syscirculation[Systemic Vasculature]
        syscirculation --> ivc[IVC]
        syscirculation --> svc[SVC]
    end
    subgraph pulmcirc
        direction BT
        pa --> pulmcirculation[Pulmonary Vasculature]
        pulmcirculation --> pulmveins
    end
end
pulmveins[Pulmonary Veins] --> la[Left Atrium]
rv[Right Ventricle] --> pa[Pulmonary Artery]
lv[Left Ventricle] --> aorta
ivc --> ra[Right Atrium]
svc --> ra