Human adult heart.
In the adult heart, deoxygenated blood enters the heart through the right atrium (RA), passes to the right ventricle (RV) and is pumped from there to the lungs via the pulmonary trunk. Oxygenated blood returns to the left atrium (LA) of the heart and is then pumped from the left ventricle (LV), through the aorta, to the systemic circulation. The tricuspid and mitral valves prevent reverse flow of blood between the ventricles and the atria. Other arteries and veins associated with the adult heart are also depicted in the image.