Follow the "blood" (colored water) all the way through the circulatory system. Flows through transparent veins, arteries, capillaries, and heart chambers. Depicts venous blood as reddish-purple and arterial blood as bright red to show the process of oxygenation of the blood. Mounted on baseboard with support legs. Comes with teacher's guide, red dye, and a syringe for refilling the system. 15" x 16" x 3".