Get your hands on some super science fun with this easy-to-use model. Simply add water and squeeze the pump to explore how blood flows through the heart and into the lungs to get oxygen. The included Activity Guide provides detailed reproducible diagrams and fun facts about the heart, lungs and human body. The set includes the assembled model, base stand, hand pump, and a water-soluble red dye. The back of the model features labels which summarize the key functions of the heart and lungs. The model measures 28 cm (about 11") wide.