This Torso System Model features functioning systems intended to help students learn about body processes. In conjunction with the Teacher's Guide, this highly interactive models allows students to conduct activities on the functions of each system. Nervous System: Registers sensory responses. Digestive System: Effectively illustrates the passage of food through the body. Circulatory System: Latex heart can be pumped, forcing fluid through transparent tubes representing blood vessels. Urinary Systems: Functioning of kidneys, bladder and urethra are demonstrated. Respiratory System: Demonstrates inhalation and exhalation. Grades 3-9.