Colorful easy-to-understand action figures protray the form and function of three vital human body systems. Set includes posters of : Circulatory system: special attention is paid to the pulmonary circulation providing understanding of the primary role of blood as the vehicle for oxygen distribution to all parts of the body. Digestive system: reinforcing the colorful depiction of the entire alimentary tract, supplementary action figures demonstrate the role of the epiglottis in swallowing, peristalsis, tooth types, and the intestinal villi. The diagram of the respiratory system: augmenting the primary cutaway view of the respiratory system, color-coded action figures demonstrate the opening and closing of the vocal cords, oxygen and carbon monoxide being exchanged in the capillaries of a lung sac, and the expansion and contraction of the rib cage and lungs during respiration.