Learning Resources Pumping Heart Model. Demonstrate the functions of a human heart with this hands on pumping heart model. Use the hand pump to show pulmonary blood flow and heart function. Add coloured liquid to the transparent model to demonstrate how the heart and lungs work together for oxygen exchange. Features clearly labelled heart chambers, main artery, veins and lungs. Includes 10 packs of dye and activity guide. Ideal for primary science teaching. Measures 30cm W x 27cm H. Suitable for ages 8+.