The essential organ related to blood transfusion is the heart. The courses transport oxygenated blood to the body from the heart, while the veins transport deoxygenated blood to the heart for decontamination from different body regions.
The pulmonary veins send the oxygenated blood from the lungs to the left chamber. This interaction is known as auricular flow.
Next, Oxygenated blood from the lungs is carried to the left chamber by the pulmonary vein. It is the only vein that carries oxygenated blood in the human body in the human body.