Engaging in this hands-on experiment not only made learning about the complex human circulatory system fun but also helped the fourth-grade students better understand the concept. They constructed a heart model using three recycled drinking bottles, two straws, clay, and 500ml of red liquid to represent human blood. Through this immersive activity, the students gained a deeper comprehension of the functions of the atrium and ventricle in pumping and receiving blood within the human body. Their a