Parts of Human Heart and Its FunctionAtria (Right and Left Atrium)Upper chambers that receive blood.Right atrium receives deoxygenated blood from the body.Left atrium receives oxygenated blood from the lungs.Ventricles (Right and Left Ventricle)Lower chambers that pump blood out.Right ventricle pumps deoxygenated blood to the lungs.Left ventricle pumps oxygenated blood to the rest of the body.Valves (Tricuspid, Pulmonary, Mitral, Aortic)Prevent backflow of blood, ensuring it flows in one direction.SeptumThe wall that separates the right and left sides of the heart.Blood vessels (Aorta, Pulmonary Artery, Pulmonary Vein, Vena Cava)Aorta carries oxygenated blood from the heart to the body.Pulmonary artery carries deoxygenated blood to the lungs.Pulmonary vein carries oxygenated blood from the lungs to the heart.Vena cava brings deoxygenated blood from the body to the heart.