Draw the pathway of blood flow through the circulatory system of a mammal. Label in your pathway: lungs, tissues, left and right ventricles, systemic and pulmonary circuits, left and right atria, tricuspid and bicuspid valves, and semilunar valves, aorta, pulmonary vein, pulmonary artery, and vena cava. Indicate in your drawing as to which major arteries and veins carry oxygenated blood and which carry deoxygenated blood.