Abstract
Many science textbooks for elementary school students explain that the function of the heart is similar to that of a water pump. But most students in Japan do not use a water pump in their daily lives and do not know much about a water pump. From such a viewpoint, we developed a simple and inexpensive pump as a model of the heart in our previous work. In this work, we used the pump in science classes of elementary school to investigate its usefulness. In addition, we developed three new pumps of different size and structure to enhance students' understanding of the mechanism and the performance of the heart.
