Blood Circulation

Coronary Circulation
Oxygen-poor blood from the different parts of the body enters the superior vena cava and inferior vena cava, the largest veins, and then goes to the right atrium of the heart. This blood passes through the tricuspid valve as it is pumped from the right atrium to the right ventricle. The right ventricle pumps the blood, which flows through the pulmonary valve, to the pulmonary artery, and then to the lungs. This movement of the blood from the heart chambers to the heart tissues is called coronary circulation. Coronary circulation takes place when blood flows through the heart.

Pulmonary Circulation
Pulmonary circulation, another type of blood circulation, takes place as the blood moves from the heart to the lungs. The blood that enters the lungs is poor in oxygen but rich in carbon dioxide. In the lungs, exchange of gases takes place. Carbon dioxide is removed and breathed out, while oxygen is breathed in and absorbed by the blood.