* Pulmonary blood circulation- It is the part of circulation involving the purification of blood in lungs. Impure venous blood is pumped by the right ventricle. The pulmonary arteries carry this blood to lungs, where it is oxygenated. Four pulmonary veins carry this oxygenated blood from lungs to the left atrium. This cause of circulation from right ventricle to the left atrium is called pulmonary blood circulation.

* Coronary blood circulation- This circulation involves blood supply to the heart itself. The right and left coronary arteries arise from ascending aorta, suply blood to the heart and the venous blood is collected by the coronary sinus with opening to the right atrium.
          

                 *************