Pumping Heart Model. Easy-to-use, multi-sensory model uses a simple hand pump to demonstrate basic heart and pulmonary blood flow. Create a memorable exploration of how the heart and lungs work together for oxygen exchange. Includes clearly labeled heart chambers, main artery, veins and lungs, plus Activity Guide. Heart measures approximately 12"L x 11"W x 5"D. Grades 3+ Details:Model uses a simple hand pump to demonstrate basic heart and pulmonary blood flowClearly labeled heart chambers, main artery, veins and lungs, plus Activity GuideHeart measures approximately 12" x 11" x 5"Grades 3+For ages 8 and up