The heart is a intricate system of parts with different functions that work together simultaneously. The right side of the heart serves as the pulmonary circuit pump. Deoxygenated blood from the body enters through the superior vena cava or inferior vena cava and flows down into the right atrium. As deoxygenated blood leaves the right atrium, it passes through the right ventricle, pulmonary valve, and pulmonary arteries until it reaches its final destination; the lungs. Once the blood enters the lungs, carbon dioxide is removed from the blood, while oxygen is absorbed. This newly oxygenated blood is now able to serve its optimal purpose in the body.
The left side of the heart is referred to as the systemic circuit pump. One deoxygenated blood receives oxygen from the lungs, it enters the heart through the pulmonary veins, and proceeds to travel through the left atrium, the left ventricle, and finally the aorta. From the aorta, the blood enters different arteries and is transported to different tissues of the body. Once the blood becomes deoxygenated again, the veins carry the blood back to the heart, where this cycle starts again.