a teacher points to a purple organ model positioned in the left side of an anatomical torso display. The organ model shows tiny tubes filtering red blood cells while producing white protective cells. As the teacher explains, the model demonstrates how blood flows through the organ and comes out cleaner. White blood cells emerge from the organ model like tiny defenders ready to fight infection. Students lean forward with fascination as they observe the filtering process in action. an organ in the abdomen that filters blood and produces white blood cells