On May 26, ACES students learned more about the circulatory system. They participated in a design challenge as well, using a unique combination of tubing, pumps, and one-way valves, ACES students competed to model the heart’s pumping action and gain a better understanding of how blood circulation works in the body. Students constructed models of blood flow through a closed-loop system and performed a series of increasingly complex design challenges to demonstrate their knowledge of how vessels, heart valves, and contracting chambers work together.