The flow from the right atrium to the right hand and back would be as follows:
Right Atrium - Tricuspid Valve - Right Ventricle - pulmonary semilunar valve - pulmonary artery - lungs (arterioles, capillaries, venules), Pulmonary vein, Left atrium, bicuspid valve, left ventricle, aortic semilunar valve, aorta, left subclavin artery, left axillary artery, left brachial artery, arterioles, capillaries, venules, left brachial vein, left axillary vain, left subclavin vein, vena cava, right atrium
