🧪 Kidney Filtration Lab: Modeling the Urinary System (Hands-On Science Activity) Looking for a high-engagement, hands-on lab to teach the urinary system and scientific modeling? This interactive Kidney Filtration Model Lab allows students to simulate how the kidneys filter blood using simple materials like food coloring, cornstarch, iodine, and a coffee filter system. Students observe, analyze, and connect their model to real kidney structures such as nephrons. Perfect for middle school life